I got an unlocked S8 about a month ago and it worked great, today I changed the sim card and the S8 did not read the card. I thought it was the sim so I put the sim card that was previously in it back in and it does not work. All the sim cards work on my S5 Neo. I have restarted the phone, I have done a factory reset, I have cleared the cache. Nothing worked.
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That's not good 😞
May I ask where you purchased it from?
I'm hoping it's not been imei locked.
In the UK we have a site called Checkmend that shows if a phone has been blocked.
Ensure the SIM card is seated properly and there's no foreign object such as long etc on the SIM card slot.
If all else fails then you could try using a Samsung Service Centre or Samsung Experience Store for help.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.
I didnt purchase it myself so I'd have to ask, a relative bought it for me as a gift.
Is that what happens to imei blocked phones though? It just doesn't recognize any sim at all?
I'll try and check if that's the case.
I have also checked if there's anything in the sim slot, so far I see nothing, nothing that is big enough to see anyway.
We can arrange a courier to collect your phone and take it to our Service Centre if you like, @Larrylogoh? If you want to go ahead with this, send me a message and I'll get it sorted!