Group Message Coming Individually iPhone Dual Sim: Complete Guide

If your iPhone group messages are splitting into individual texts, the problem may involve the message type, carrier support, or Dual SIM configuration. A group SMS behaves differently from group MMS, RCS, and iMessage. Before resetting anything, identify which type of conversation you have and which phone number is sending the messages.

Key Takeaways

Why iPhone Group Messages Split

iPhone group messages split primarily because Group SMS does not support shared replies. When someone responds to a Group SMS, their reply arrives as an individual message rather than appearing for everyone in the group.

However, having an Android user in a conversation does not automatically cause this problem. Modern iPhones can also exchange group messages through MMS or RCS, depending on network support.

Apple’s official group messaging explanation identifies four message types. Knowing their differences is the fastest way to diagnose a split conversation.

For example, a conversation with three iPhone users may work as a blue iMessage group. Adding someone who does not use iMessage requires a different messaging service. If the devices and carrier support Group MMS or RCS, replies can still remain together.

If the conversation instead uses Group SMS, replies appear separately. This is expected behavior for that message type, not necessarily an iPhone hardware problem.

Dual SIM adds another possible cause. When conversations use different phone numbers, they may not appear as one continuous thread. The selected line can also affect which carrier handles SMS, MMS, or RCS.

Check iMessage and MMS Settings

Start by reviewing the Messages settings on your iPhone. An inactive iMessage number, unavailable MMS service, or disabled RCS option can affect how group conversations work.

On recent iOS versions, open Settings > Apps > Messages. On older versions, Messages may appear directly in Settings.

iMessage Settings Check

iMessage works through Apple’s messaging service and supports shared conversations when all participants use iMessage. It can use Wi-Fi or cellular data.

1. Open Settings.
2. Tap Apps, then Messages.
3. Confirm that iMessage is enabled.
4. Tap Send & Receive.
5. Check that the phone number you want to use is selected.
6. Review the Start New Conversations From setting.

If your phone number is missing or inactive, resolve that issue before troubleshooting the group itself.

This is particularly useful after switching SIM cards, activating an eSIM, or moving to a new iPhone.

If iMessage was previously working but now shows an activation problem, confirm that the intended cellular line is active. A software update and a fresh iMessage activation attempt may help.

Remember that enabling iMessage cannot turn a mixed iPhone-and-Android group into an iMessage conversation. That group needs compatible carrier-based messaging instead.

MMS Messaging Enabled

MMS, or Multimedia Messaging Service, allows compatible carrier-based group conversations to share messages and media.

If your iPhone supports the option, use these steps:

1. Open Settings > Apps > Messages.
2. Find MMS Messaging and turn it on if available.
3. Look for Group Messaging and enable it if your carrier provides that control.
4. Confirm that the relevant cellular line is active and cellular data is available.
5. Restart Messages and test a new group conversation.

Not every iPhone displays the same messaging switches. If MMS Messaging or Group Messaging is missing, that does not automatically mean the phone is defective.

The available settings depend on carrier support and configuration. Contact the carrier if a required messaging option is unavailable or group MMS fails.

Also check whether RCS Messaging is available. RCS, or Rich Communication Services, adds features such as higher-quality media, delivery receipts, and typing indicators.

Apple’s RCS setup instructions use Settings > Apps > Messages > RCS Messaging. RCS requires a supported carrier and compatible software and is not available on every plan or network.

Dual SIM Selection

Dual SIM iPhones can send and receive messages using two phone numbers. However, the selected cellular data line, default voice line, and messaging line serve different purposes.

Check Settings > Cellular and review both plans. Make sure the number you expect to use is active.

Then confirm these settings:

• Default Voice Line: The preferred number for calls and certain new contacts.
• Cellular Data: The line normally used for mobile data.
• Messages conversation line: The number used when sending that conversation’s messages.
• iMessage Send & Receive: The phone numbers and addresses enabled for iMessage.

These settings are related, but changing the default voice number does not automatically change every existing conversation.

If the problem started after changing SIM cards, check which phone number the group originally used.

Turn On Group Messaging for Dual SIM

There is no separate universal Group Messaging switch that controls both SIM cards on every iPhone. Group messaging depends on the active conversation line, available messaging services, and carrier support.

Use the following process to avoid changing unrelated settings.

Select Correct SIM

Select the phone number you want to use when starting a group conversation. This matters when one plan supports messaging features that the other plan does not.

1. Open Settings > Cellular.
2. Confirm that both expected cellular lines are listed and active.
3. Open the Messages app.
4. Tap the Compose button in the upper-right corner.
5. Enter a contact’s name.
6. Tap the current sending number shown in the compose view.
7. Select the intended phone number.

Apple’s Dual SIM messaging instructions explain how to select a line when sending messages and how supported conversations can use another number.

If you need to change the line for an existing conversation, open its details and look for the current phone number or Conversation Line option.

The exact control can vary with the iOS version and message type. Some existing SMS/MMS conversations may require a new thread to use a different line.

Practical example: If your personal SIM receives normal group MMS but your business SIM receives only individual SMS replies, test each carrier separately before resetting the iPhone.

Enable Group Messaging

Once you have selected the correct SIM, verify that its carrier supports the message type needed by your group.

Follow this checklist:

1. Confirm that the chosen plan supports SMS and MMS.
2. Enable available MMS and Group Messaging options.
3. Enable RCS if the carrier supports it and your group can use it.
4. Send a test message to a group containing at least two other people.
5. Ask one participant to reply to everyone.
6. Check whether the reply appears in the original group conversation.

If replies remain in the group, the service is working as expected.

If each reply creates an individual thread, the conversation may be using Group SMS. Check the carrier’s MMS/RCS support rather than repeatedly toggling iMessage.

When available, a new group conversation is a useful test because it avoids confusion from earlier messages sent through another number or messaging service.

Start a Group Message on iPhone

Creating a new group message is straightforward once the correct line and messaging settings are selected.

1. Open the Messages app.
2. Tap Compose in the upper-right corner.
3. Enter the first contact’s name or phone number.
4. Add the remaining recipients in the To field.
5. On a Dual SIM iPhone, review the sending number before sending.
6. Type your message.
7. Tap Send.

The iPhone automatically determines the available messaging method based on participants, settings, connectivity, and carrier support.

If everyone uses iMessage, the conversation normally appears with blue bubbles.

If at least one recipient cannot use iMessage, the conversation may use MMS, RCS, or SMS instead.

To check your result: Have participants send replies. A working group MMS or RCS conversation should show group responses together rather than creating a separate private reply from each person.

If only one recipient’s replies arrive separately, confirm that the contact has the correct phone number and ask whether their device is sending group messages rather than individual SMS texts.

Add Contacts to an Existing Group Thread

You can add someone directly to an existing iMessage group only when the conversation meets Apple’s group membership requirements.

Apple allows adding someone when the group already contains at least three participants and the person being added uses an Apple device with iMessage.

To add an eligible participant:

1. Open Messages.
2. Select the existing group conversation.
3. Tap the group icons at the top.
4. Tap Add in the participant list.
5. Enter the person’s contact details.
6. Tap Done.

According to Apple’s group participant instructions, you cannot directly add a non-iMessage user to an existing iMessage group. Instead, start a new group conversation with everyone included.

Similarly, if the existing conversation contains only you and one other person, create a new group rather than looking for an Add option.

These restrictions are separate from Dual SIM configuration. Switching SIM cards does not remove the group membership requirements.

Fix Public Mobile APN Issues

If your group messages split while using Public Mobile, check the messaging service and carrier configuration before changing APN settings.

APN stands for Access Point Name. It tells your phone how to connect to the carrier’s mobile data network. Incorrect settings can interfere with data-dependent services, including MMS.

The original configuration issue deserves special attention because Public Mobile currently publishes sp.mb.com as its cellular data APN, rather than isp.mb.com in its standard iPhone setup instructions.

Public Mobile’s official iPhone APN guide lists the following setting:

• Cellular data APN: sp.mb.com

This is the carrier’s published data setting. Do not assume that the cellular data APN and every separate MMS or hotspot field must contain identical values.

How to Check the Public Mobile APN

1. Open Settings.
2. Tap Cellular.
3. Select the Public Mobile line if your iPhone displays separate line settings.
4. Look for Cellular Data Network.
5. Review the cellular data APN if the option is available.
6. Compare it with Public Mobile’s published instructions.
7. If a correction is needed, confirm the correct settings with Public Mobile first.
8. Restart the iPhone after an approved change and test group messaging.

If Cellular Data Network is missing or changes will not save, contact Public Mobile support. Carrier-managed settings may prevent manual editing.

Check Public Mobile Group MMS Support

Public Mobile states that its rate subscriptions with data include picture and group messaging through MMS. Its documentation also says MMS does not count against the plan’s data allotment.

The carrier’s picture and group messaging guidance explains that some customers may need updated software or settings for continued compatibility.

If regular SMS works but group MMS does not, try the following:

• Confirm that your subscription includes the required messaging service.
• Make sure cellular data is enabled and functioning.
• Check whether the iPhone has a pending software update.
• Ask Public Mobile to verify MMS provisioning for the affected line.
• Test a new mixed-device group after the carrier confirms service.

Provisioning refers to how the carrier activates and configures services on your phone number.

A line can sometimes send ordinary SMS while having a separate MMS problem. This is why individual text delivery alone does not prove that group messaging is properly configured.

Mute or Leave a Group Chat

If you want fewer interruptions from a busy conversation, you can mute it without deleting the messages. Leaving is another option, but it is restricted to eligible iMessage groups.

How to Mute a Group Conversation

1. Open Messages.
2. Select the group conversation.
3. Tap the group icons at the top.
4. Find Hide Alerts.
5. Turn Hide Alerts on.

You can still open the conversation and read its messages. Muting simply stops normal notifications from that specific thread.

How to Leave a Group Conversation

Apple allows you to leave an iMessage group when at least three other people are in the conversation and everyone is using iMessage.

1. Open the group conversation.
2. Tap the group icons at the top.
3. Scroll down to Leave This Conversation.
4. Tap the option and confirm.

Apple’s group leaving and muting instructions explain these restrictions.

If Leave This Conversation is unavailable, the group may include a non-iMessage user or may not have enough participants.

You generally cannot leave a standard carrier-based SMS or MMS group through the same iMessage control. Muting the conversation is often the more practical choice.

After leaving an eligible iMessage group, you cannot simply rejoin it yourself. Another participant must add you back.

Reset Network Settings Last

Resetting network settings is a troubleshooting step to use only after checking Messages, Dual SIM line selection, carrier support, and available software updates.

A network reset can clear stored network configurations, but it cannot change the basic behavior of Group SMS or make an unsupported carrier service available.

Before resetting, check whether a carrier settings update is waiting. Apple’s carrier settings update guide explains how to check Settings > General > About and install an available update.

If the problem continues, consider the reset below.

Steps to Reset Network Settings

1. Open Settings.
2. Tap General.
3. Select Transfer or Reset iPhone.
4. Tap Reset.
5. Select Reset Network Settings.
6. Enter the device passcode if requested.
7. Confirm the action.
8. Reconnect to Wi-Fi and review the cellular configuration afterward.

Apple’s network reset documentation explains what the reset changes and which settings are affected.

Reset Network Settings does not erase your photos, messages, or other personal content. It is different from erasing the iPhone.

After the reset, verify that both SIM lines are enabled. Then review Messages settings and start a new test group.

If the conversation still produces separate SMS replies, the problem may be related to the message type or carrier provisioning rather than a corrupt network setting.

When to Contact Your Carrier

Contact your cellular provider when ordinary SMS works but group MMS or RCS repeatedly fails, especially if the problem affects only one of your two SIM lines.

Before contacting support, collect the following information:

• The affected phone number and carrier.
• Whether the problem happens on one SIM or both.
• Whether regular one-to-one SMS messages work.
• Whether the group contains iPhone users, Android users, or both.
• Whether MMS Messaging, Group Messaging, or RCS options appear in Settings.
• Whether mobile data works on the affected line.
• Whether a new group behaves differently from an existing conversation.

Ask the carrier to confirm that group MMS is supported and correctly provisioned. If applicable, ask whether RCS is available for your line and whether a carrier settings update is required.

For Public Mobile, request confirmation of the relevant APN and MMS configuration rather than changing values from unofficial sources.

If the carrier confirms that SMS, MMS, and RCS are functioning properly but iMessage still fails, contact Apple Support for further diagnosis.

Frequently Asked Questions

Why Are My Group Chat Messages Sending Individually on My iPhone?

Your iPhone may be sending a Group SMS, which delivers replies separately by design. A mixed-device group can stay together with Group MMS or RCS when the carrier and participants support it. Check the message type before changing your Dual SIM settings.

Why Are Group Messages Coming in Separate?

Separate incoming replies usually mean the chat is using Group SMS instead of Group MMS or RCS. Another possibility is that the conversation uses a different sending number after a SIM or phone change. Confirm the active line and ask your carrier about group messaging.

Why Are Group Texts Splitting on My iPhone?

Group texts can split when iMessage is unavailable and the carrier falls back to Group SMS. Green bubbles alone do not prove a problem because Group MMS and RCS also use green. Test a new conversation after checking the carrier-supported messaging options.

How to Fix Group Messaging on iPhone?

Open Settings > Apps > Messages, verify iMessage and the phone number in Send & Receive, and enable available MMS or RCS settings. Then choose the intended Dual SIM number in Messages and test a new group. If replies still split, ask your carrier to check MMS provisioning.

Conclusion

When iPhone group messages arrive individually on a Dual SIM device, first check whether the conversation uses Group SMS. If it does, separate replies may be normal. For shared group conversations, confirm iMessage, MMS, or RCS support, select the correct phone number, and verify carrier settings. Use a network reset only after simpler fixes fail, and contact your carrier if group messaging remains unavailable.

Sources

1. Apple Support: Send a Group Text Message: Defines Group iMessage, Group MMS, Group SMS, and Group RCS and explains their different reply behaviors.
2. Apple Support: Using Dual SIM with an eSIM: Explains phone number selection and messaging with two cellular lines.
3. Apple Support: Turn On RCS Messaging: Covers RCS requirements, available features, and settings.
4. Apple Support: Add and Remove People in Group Text Messages: Documents participant requirements and restrictions.
5. Public Mobile: Changing APN Settings on an iPhone: Provides the carrier’s published cellular data APN and setup guidance.
6. Public Mobile: Picture and Group Messaging Changes: Explains MMS compatibility, plan support, and software updates.
7. Apple Support: Leave a Group Text Message Thread: Explains group leaving and muting restrictions.
8. Apple iPhone User Guide: Reset iPhone Settings: Explains network reset steps and their effects.
9. Apple Support: Manually Update Carrier Settings: Explains how to check for and install carrier configuration updates.

Related reading

• Group Texts Coming Through Individually iOS 15.8 iPhone
• Group Text Has One Person Coming Separate: Complete Guide
• Why Do I Get Separate Message Through Group Chat to iPhone?
• iPhone Group Message Appears in Another Conversation