SOURCE: Invalid sim
That's cause your phone , you buy bundle with sim card, so provider protect phone to use sim by other provider, or you ever set phones password to use sim, if nothing like that go to service center to solved your problem.
SOURCE: ithe second sim slot says invalid sim
i think the phone use other provider than your sim card if you put orginal sim card from provider in it the sim card wil be acces
unlocking the phone you can acces all providers
you have contact old provider they wil give you unlock
codes after one year for free , you have to give them your imei number
you see it under battery or by pressing *#06# and also the old phone
number they wil also handel it with email
SOURCE: INVALID IMEI NUMBER
type *#06# for checking the IMEI hope it would help u (plz rate me ) thank you.
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