Open search

Galaxy s8 not recognising sim

First Poster

Hello. My Galaxy S8 is not recognising my sim, so I am unable to make calls or send texts. I have tried restarting it, removing the sim, and doing a network search. Nothing is working :o/ 

Any suggestions? Cheers 

Superuser I
Superuser I

Hi @Backpackersteve, could be down to the sim it's self, 1st try in another phone. 2nd thing to try is to give it a clean a little WD40 on a soft cloth will work or methylated alcohol (both will remove dirt/grease from the sim, 3rd try another sim in the S8 pop in to a local phone shop and pick up a sim (best is the same network if not sim free).


If the sim works in another phone still give it a clean, give the slot slot a blow out (a balloon with a straw in it creates a good jet of air) if not luck still and the spare sim has not worked it needs to go the the retailer. Hope that helps you out

I had the same problems with my S8+. The sim was working fine in my previous S7 edge for some weeks, and then worked in the S8+ for the first few days. Then nothing. No phone calls, no texts, no data connection. Samsung sent me a new S8+ replacement and I got my sim provider to send a new sim, not willing to experiment with what/who the problem could be just before going on holiday. Bit of a bind having to wait for another S8+ after being one of 1st to get it, but new phone/new sim are working fine.


It would be interesting to hear whether a new sim and/or phone is needed for you @Backpackersteve and if we are the only two with this problem. I was disappointed that I had fitted a brand new screen protector to my first (broken) phone, but Samsung would not reimburse this with the replacement of a phone just 4 days old.

New Member

You are definitley not the only one.  I have been experiencing this since I first got the S8 when it just came out.  The problem disappeared for a while and now it's happening almost daily for me.

New Member

My Galaxy S8plus stoped recognizing one of my sims, but the same sim works with other phones. What could be the problem and what is the solution?

First Poster

Happened once before on my s8 several months ago.  Now 3 times in 2 days... Not good.  


Daft question


Have any of you that's having g the problem, trimmed the SIM yourself? It  COULD be that you trimmed it a bit too small?


If it's a network supplied nano SIM, blow air into the slot (just in case) n wipe the SIM and most obvs make sure you've inserted the tray all the way in n the SIM is secured properly and the tray is right way up.


Also, make sure if it's not a simple case of the wrong SIM on a network locked handset.


First Poster

No. Never messed with it at all.  Didn't buy a locked phone.  It's the one Sprint gave me.  And it worked for months till this weekend.  I'm wondering if it just needs cleaned. 

New Member

Hello I have similar prob here. Got an S8 plus few days ago it's having WIFI probs can't connect as well as not being able to make calls. However I can send and receive text messages but no calls n wifi connection is on and off not stable. Can Samsung help me out pls or give me another phone thanks.

New Member
Also it keeps saying SIM ERROR OR NO SIM but the SIM does work on my old phone. Pls help thanks
Top Liked Authors