[solidus1983]

Hi i have a Lumia 640 059X133 which was a Sim Free phone thus unlocked out the box.
Now i have already flashed the 059X1Q3 EE Firmware (VOLTE) and updated the Product code from 059X133 to 059X1Q3 via thor2.

But i totally forgot about the SIMLOCK. So i was wondering if flashing a Unlocked device with Locked carrier firmware effect the SIMLOCK or will the device still be unlocked.

[abhishek singh21]

Never been where you are but i believe it will effect simlock.

[solidus1983]

Thanks for the reply, so guess i am going to need another sim to test it out. I take it if the device has gone back to locked inserting any sim other then EE should bring up the code request?

[libra89]

It shouldn't activate the lock since your phone is already unlocked when you bought it. However the sim tray was originally is how it would stay.

Edit: I haven't had personal experience with this but stateside, people usually do the opposite of what you are planning to do and it works fine. They have unlocked a carrier locked 640 and flashed it to an unlocked one without issues.

[solidus1983]

Thanks libra89 for you reply i can now stop panicking.

I knew with android phones that cross flashing didn't effect the Simlock however wasn't sure about Windows devices.