If I buy an iPhone gsm with bad esn I can unlock it and activate it on tmobile?

So if I buy an iPhone gsm with bad esn I can unlock it and activate it on tmobile?

IPhone which is GSM can't have bad ESN as they've IMEI and you mean blocked IMEI. There's a chance you might be able to get that to work but the block must be removed. Check online for unblocking the iPhone and you might find some help.

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