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Sim suddendly isn't reconized from the phone

Hi !
My Htc one S sometimes show the advice that indicate that there is no SIM inserted, even if the sim is there and even if the phone is already power on, it shows the message after some times it's on. Any suggest?

Have you tried a different SIM card? Could be something wrong with the card. Also make sure all the contacts on the SIM and phone are clean.
If it still doesn't work then looks like you'll have to go back to HTC.

My SIM didnt work in my S when I got it.
After some googling it seemed quite common on the X.
The general answer was "get a new SIM". I got a new SIM and it solved my problem at least.
If a new SIM doesnt work, it might be a hardware issue with your device and you should probably return it.

actually I just have one micro SIM and I cannot try a switch. Also in order to try I would need to take the other sim for long time because this happen with a low frequency..

Get it exchanged from your carrier. Shouldnt cost much, if anything at all (Telia here in sweden didnt charge anything at least).

Tab 2 "No SIM"

So, I picked up a cheap Tab 2 3g 7". Everything seems to work fine other than it refuses to understand sim cards!
When I put a sim in with it on, it does the "you must restart", but after a restart it still says no sim. Take the sim out, it tells me to restart...
I discovered if I just push a sim adapter in the slot it does the same, I think there's a microswitch that just tells the thing whether or not there's something physically in the slot.
Tried with three different sims, all working in my phone.
I was wondering - This tablet takes the old mini sim. Although the active pins seem to be the same between those and nano, could the Samsung be looking for continuity or something between the usually unused pins? Or perhaps some other electrical compatibility issue? The tablet's in pretty good condition, the slot feels fine, so I don't want to just assume this is a hardware issue.

Need an expert on SIM cards to chime in.....

Alright, so a little back story on the problem i'm having:
I've got a Mofi4500 SIM4 wireless modem with service from an MVNO using T-Mobile's network.
The service worked great for the last several months despite a video throttling issue. Long story short, i determined the Phone number associated with the SIM was being throttled either the MVNO or T-Mobile, so they're shipping me out a new SIM card.
Here's the issue: They disabled the current SIM (which is providing us service) when they programmed the new SIM before they shipped it out. In the MOFI's control panel, there is no phone number detected on the sim (did they delete the phone number remotely?)
So we're currently dead in the water with no internet access, and my wife isn't too happy since she works from home. I called their tech support to get the SIM reactivated, and they said no problem, should be done within an hour.
2 hours pass, still not working! I jump back in the MOFI's control panel to see whats going on, and it seems that its still not detecting a phone number on the SIM. The Sim card, SIM ID, and T-Mobiles APN are all detected and correct, but the Phone number is not. even now (the next morning) after several reboots of the modem and factory resets there is no phone number detected.
We USED to run the MOFI on AT&T's network and still have that sim card, so i popped that in the MOFI to see if it could detect a phone number on that sim, and sure enough all that information along with AT&T's APN is there. so the Mofi's sim card reader isn't broken, it does have the ability to read a sim card correctly.
My question here, how did the MVNO supposedly "reactivate" the sim card remotely when the sim card has the Phone number deleted and the router has no access to the web? is it even possible to change a SIM's phone number remotely? Is it possible to reactivate a SIM remotely when the SIM has no access to the internet?
If it is indeed possible, any idea on why the sim not able to update?

Sim card and network problems

Have a note 20 ultra 5g that keeps telling me no sim card, no cellular network available. Have replaced sim card readers 2x in both motherboards, still the same. Have also tried another motherboard known good and get the same thing. But whats weird is on the motherboard that was Verizon unlocked it will tell me the phone number on the sim card. The known good motherboard that is unlocked factory. It will say the same thing. The verizon one will say sim card provider changed restart to new carrier and will reboot to T-mobile. I have replaced almost everything on the middle case as in connectors and such. Both motherboards will tell me phone number on sim card and have also tried a few different sim cards. All the same problem. Someone told me that the middle frame is the problem, but I don't believe that. Have also the verizon motherboard installed and sent this phone to Samsung and all they said was new motherboard needed, At a cost of almost $700.00. Still sim card problem and I have run out of ideas.

Question Insert SIM Card Problem

HI,
I bought my son A53 in best buy in the United States
my phone version is SM-A536U1/DS I was told the phone is unlocked
I am in Israel now and everything was fine for 5 months and I had no problems
but in the last week the phone cant find my SIM card and I get a message saying
Insert SIM Card and my phone cant find the SIM
What Can I do to fix this Problem?

well either there is hardware fault or maybe the sim cannot be read.
i suggest try cleaning the sim first with a soft sponge or q-tip. If the problem persists try blowing compressed air in the sim slot. If that doesnt work either try your sim in some other working phone. If it works then your phone is faulty.