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iPhone Messaging Issues After SIM Swap : Guidance for Partners

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When customers swap SIMs (e.g. new service activation, port-in, or replacement), they may report that messages are showing as “Not Delivered”.

It’s important to distinguish between SMS/MMS (carrier responsibility) and iMessage (Apple service):

  • If SMS/MMS are not working → follow the checks below. If still unresolved, log a ticket with CommsChannel.

  • If SMS/MMS are working but iMessage is not → this is an Apple/iOS issue. The troubleshooting steps below are provided as an assistance guide only. These cases should not be logged with CommsChannel.

Step 1: Confirm SMS Functionality

  1. Test SIM in Another Device – Place the customer’s SIM in a known working handset.

    • If SMS works in the second handset → issue is device/iOS related (iMessage or device config).

    • If SMS does not work in the second handset → proceed with network/SMS checks.

  2. Restart the iPhone and toggle Airplane Mode to clear network cache.

  3. Check coverage – ensure the device has a stable mobile signal.

If SMS is still not working after these checks → log a ticket with CommsChannel Helpdesk, including number, device details, and steps already performed.

Step 2: If SMS Works but iMessage Fails 

Advise the customer to check the following on their iPhone:

Quick Fix:

  • Restart iPhone and toggle Airplane Mode.

  • Check internet connection (Wi-Fi or mobile data).

Settings to Verify:

  1. Correct Number in Settings – Go to Settings > Phone and confirm the correct mobile number is listed.

  2. Enable iMessage and Send as SMS – Go to Settings > Messages and confirm both are on.

  3. Send & Receive Configuration – In Settings > Messages > Send & Receive, confirm the correct phone number is ticked.

  4. Carrier Settings Update – Go to Settings > General > About. If prompted, install update.

Advanced Options

  • Reset Network Settings – Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.

  • Factory Reset (last resort) : only attempt Factory Reset if recommended by a qualified Apple or IT technician.

  • Apple Support – For unresolved iMessage cases, advise customer to contact Apple directly.

Note For Partners:

  • Only log tickets with CommsChannel if SMS is not functioning on multiple handsets.

  • iMessage issues are outside carrier scope, partners should manage these directly with the customer or Apple.

  • Always confirm troubleshooting steps taken before escalation.
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