Unlock first.... Don't turn the phone on with a SIM in it.
May very well be a good advise...something I didn't know when I bought my phones...but, I got two AT&T gophones for backup from Best Buy, turned both of them on with their sims still in, went through the set up process, turned them off, removed the AT&T sims, inserted the T-Mobile sims, turned them on, was asked for the unlock code, wrote the unlock codes I got from AT&T, and phones are now unlocked, and working flawlessly.
So you had the unlock codes before you turned them on with the GoPhone SIM in? Or they sent you the code after?
Because reports are if you turn it on with a GoPhone or other ATT style SIM and then ask for unlock they want a length of service before supplying the code. Also if the retailer scans the activate barcode on the package and not just the sales barcode. See: http://forums.windowscentral.com/mi...-just-$59-99-microsoft-store.html#post3319203
The sequence matters for getting the code, not applying the unlock. Can you please clarify which side of powering up with a GoPhone SIM you got your code?
Code arrived before power on with GoPhone SIM or code arrived after power on with GoPhone SIM.
Going to try this again with a 640 I just ordered ($30 from Best Buy). This time I will NOT be installing a SIM until after I unlock it. Anyone want to buy a 635 ?
Well good luck. No amount of keeping the sim in a different phone worked for me.Yeah... The SIM seems to mess up the process if it is an ATT mvno. Just found that out with my 640.
I spoke at length with the Tech support at ATT and I think the solution is for me to switch my SIM back to my 1520 so that Cricket releases my IMEI from the 640. Not tested yet... I'm still playing with 640 and Insider daily.
Well good luck. No amount of keeping the sim in a different phone worked for me.