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Q: I bought a used iPhone 4 and a new sim but it keeps on saying no service. What's wrong?
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May 16, 2016 9:41 AMby ManSinha,If that is the error message then you need to bring the phone into the carrier and have them provide you with a working SIM
Who is the carrier and do they support the iPhone?
SIM lock
How to unlock your iPhone for use with another carrier - Apple Support
Activation Lock
Your iPhone is Activation Locked as described here:
