i bought LG G5 like 2 years ago and was working fine with me (i'm from egypt) and the phone was unlocked , until i factory reset my phone since it was lagging , and it asked for update and after i done it the phone only reads Invalid sim , so is there anyway to check why the phone still locked like this , if there is a pending payment or even it is clear but needs unlock ?
Model number LGLS992
Good morning. I'd like to help you with this. Go ahead and set your phone up as stated in this link. SOLUTION: Sprint Hints for Successful Unlocks I'm going to PM you to get some more info.
to be honest your best bet would be to get in contact with the original owner and either return it or see if they can request it be unlocked. it will need the Sprint sim card back in it..which might be an issue unless you still have it some place.
The same thing happened to my phone, i got it in thailand and it was working fine then I factory reset it and it did several updates now all I get is invalid sim