Original topic:

S21 Ultra sim not being read from time to time

(Topic created on: 10-03-2022 12:46 PM)
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suvb
Active Level 1
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I have been having issues of sim being not read from time to time. I keep loosing the network and internet and it happens abrubtly. Have sent it for repair service multiple times but was sent back stating nothing was wrong and replicable. Wondering if anyone facing the issue. There is no particular event or cause. It just happens. It has become a trigger at this point and the lack of empathy from the customer service this time. 
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tonyt1961
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I have the same issue on my A51. "Sim not detected ". Comes back in about a minute. Replaced simply to see of it fixes the problem but carrier says its most likely the phone. We'll see
SamsungLaura
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Hi @suvb and @tonyt1961, I suggest sending an error report within 2-3 minutes of the issue occurring for this to be investigated by our research and development team. Error reports assist with identifying any deviations in your device performance. Once analysed, our team will get back to you with a response to advise further steps.

To send an error report:
Samsung Members app > Get help > Error reports > select issue category > Describe issue and frequency > Tick ‘Send system log data’ > ‘Send’ in top right.

suvb
Active Level 1
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I have done that numerous times. Mostly within minutes..but nthing..too triggred by this now. The funny thing is I am supposed to record and send sim not detected or internet not working while that is the problem. At home I can connect to my wifi but what am I supposed to do at public
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@suvb is your carrier doing any maintenance in your area?
Or does this occur in all locations that you visit?

Might be worth checking if there's network maintenance going on and also asking them for a new sim card.
Discussion
Have you tried resetting the network settings ? Tap Reset > Reset Network Settings > Reset Settings.. possibly that could be an easy fix sometimes.
suvb
Active Level 1
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Thanks everyone. .I have sent my phone to service center 3 times already and during those periods I use the same sim in my S9+. No issues and working perfectly fine.
SamsungLaura
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Hi @suvb, I am sorry to hear that the issue persists. I can see that you sent an error report to our team regarding this. 

Our team requested additional data to look further into this. Please respond to the latest update with your phone number, state of residence, and preferred callback time via

Samsung Members > Support > Check feedback you've sent 

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Troubadour
Expert Level 2
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1. Try setting network to 4G. Sometimes when reception is weak the phone trys to switch betwèn 4G and 5G frequently, causing dropouts. 5G signal goes 1/2 distance to 4G
2. Check coverage by installing Aus Phone Towers from Google Play. Look at drag in menu on left side and change parameters to identify whether you have reception problems.
3. This won't solve your problem but definitely Google Wi-fi Calling and your ISP name (only available to Telstra, Boost, Optus and Vodafone customers). Phone calls choose the better of cell tower and wi-fi to send/ receive calls, including to wi-fi networks you are logged into, e.g. work. Well worth it as it chooses the better call quality when choosing which.