I just brought my unlocked, or so I thought, iPhone 7 to claro to get a prepago sim. After some trying, the phone came up with an error saying that the type of sim was not compatible with my phone. I bought the phone outright at Best Buy, and have been using a pre pay AT&T sim in the US.
Any ideas?
It appears your phone is carrier locked. You can borrow someone's else SIM to rule out a "bad" SIM.
"Sim not Supported" To use your iPhone with a different carrier, you would need to contact the carrier to which the iPhone is currently locked in order to arrange for it to be unlocked (Apple does not do this). Unlocking would also be subject to that carrier's whims/policy.
Contact your carrier
[url]https://www.att.com/deviceunlock/#/[/URL]
<~ ATT online free unlock link
1. See if your carrier offers unlocking. Only your carrier (carrier to which your phone is locked to) can unlock your iPhone.
2. Contact your carrier and request an unlock. Your account might need to meet requirements for unlocking.
3. After you submit the request, it might take a few days to complete. To get your request's status, contact your carrier. After your carrier confirms that they unlocked your iPhone, follow the steps below.
If you have a SIM card from a carrier other than your current carrier
Use these steps to finish unlocking your iPhone:
1. Remove your SIM card and insert the new one.
2. Set up your iPhone again.
If you don't have another SIM card to use
Use these steps to finish unlocking your iPhone:
1. Back up your iPhone.
2. After you make a backup, erase your iPhone.
3. Restore your iPhone from the backup you just made.
Get help
You might see this message in iTunes or on your device: "The SIM card inserted in this iPhone does not appear to be supported. Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carrier store."
If you see this message, use these steps:
1. Restore your iPhone to factory settings.
2. Contact your carrier to make sure that they applied the unlock in their system.
3. Restore your iPhone from a backup.