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[Q] Newbie - Understanding unlocking

18th May 2014, 11:59 PM |#1  
OP Junior Member
Thanks Meter: 0
Hi All, (I just tried to pot this but this site crashed after a three minute wait, so hope this is not a duplicate)

I have been a developer of window applications for many years and have finally decided to see about working with winphone. Sorry for the really basic questions but I am totally out of my depth here. Once I get started with the phone, the programming will not be such an issue as I have looked at some source code for winphone apps and it is all pretty straight forward stuff. I have installed the SDK and so far, so good.

I have owned a smart phone for two weeks so be gentle, please.

I have been given a Nokia 520 AT&T GoPhone as a test bed. It is of course locked to AT&T pre-paid. I would like to use the TMo SIM from my
current phone but the GoPhone spits on it with "unknown network."

I need to understand exactly what unlocking means. If I follow the process for a new ROM here...

Will the phone still be tied to the AT&T network or will the TMo SIM now work?

I have seen a section on the msoft site for dev-unlocking, I have paid the $19 fee to join the low-level devs and now wondering if that unlocking process will allow the use of the TMo SIM or must I buy an unlocked 520 or something else.

I'd really appreciate some guidance here.

19th May 2014, 09:58 AM |#2  
Recognized Developer
Flag Seattle
Thanks Meter: 2,830
GSM radio firmware is usually what controls the SIM lock, and is usually completely separate from the OS firmware. I do not believe Nokia Care Suite can SIM-unlock (or change the SIM lock) for you, although I have not personally tried.

Please do NOT continue starting new threads instead of discussing these topics on the existing threads where they belong! In addition, the question about dev-unlock vs. SIM-unlock has been asked (and answered) many times before. Rule #1 of this forum: Search Before Posting! (No, dev unlock has absolutely zilch to do with SIM lock and it won't help you there.)
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