I have an Apple iPhone 6 A1586 from the US which was a replacement device from Apple, but the previous handset would've been locked to TMobile (always GSM and never CDMA I believe).

I've inserted a new UK (GSM) SIM into the device and it's telling me the SIM is unsupported. I've checked https://www.icloud.com/activationlock/ and this tells me the device is not locked and can be activated by a new user but I'm unable to do that.

I've wiped the phone and attempted to set it up as a new device but as soon as that new SIM goes into the phone it locks up saying "SIM not supported" but it will still work when I put the old TMobile SIM into it.

Any ideas? Am I missing something here?


You might need the carrier to unlock the device.

Activation Lock in iCloud is to protect the owner of the device from theft.

SIM Lock protects the carrier revenue stream as far as I can tell. Maybe there's another legitimate use for it that I haven't considered.

  • Thanks! The phone was a replacement directly from the Apple store so I didn't think it would be locked but when on the phone with TMobile I asked and they said the device was unlocked. I suppose it's worth asking again given the messages I'm receiving? – Beerlol Oct 30 '16 at 21:41
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    Normally, when a repair phone is entered Apple transfers the lock status correctly. You can verify this by restoring the device in iTunes, @Beerlol . It will say device unlocked. In your specific case - if you restore the phone and it's not unlocked and the carrier says it should be unlocked - your first call would be to AppleCare support to have them re-do the process to move the unlock from the old Serial#/IMEI to the replacement Serial#/IMEI – bmike Oct 31 '16 at 0:08

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