Samsung S21plus not reading sim cards.

[Humpty14]

My galaxy s21plus is not reading my sim cards. No signal bar is full for a second and again it drops to zero. Device is heated as well. And performance is also very low now. Get stucked some times. What should I do now.

[GAJAN_Rajasek]

If your network is on 5g, the device is likely to overheat when coverage for 5g is low. My A22 5g did just that once. Next take the sim slot out once and clean it well and reassemble it. Next thing you know, Your s21 plus upgraded to oneui 4.1 a few months ago, so that may be the reason too.

[Sakila_Pamudith]

Hi 👋,
1. Reset your network settings 📶
2. Turn off 5G and use LTE and other
3. And turn on 5G
And if it doesn't work
4. Just reset your device

If my comment is helpful for you accept my comment as a solution 🙂

[Ranod_Lakshitha]

Hi...
Does it worked normally in previous and have you tried different carriers? 🤔
Anyway, Go to Get Help tab in this app amd select Diagnostic. Then select sim card and check whether any issue in there. ( as in the Screenshot)

Then reset your device and try. Still you have the issue contact a Samsung service center and get help from there.

If my comment is helpful to you, kindly click on the 3 dots and select "Accept Solution"
Thank you 😊

[kavinuanusara · Accepted solution]

The simple solution is restart if its not working . Try changing networks

https://www.technobezz.com/samsung-galaxy-s21-s21-plus-is-not-detecting-the-sim-card-ways-to-fix-it/

This article will help you alot . There are so many ways to fix it .

If this is helpful. Plz make it as a solution. I really appreciate it 🙏 🙂👍

[GalaxyM11User]

Have you ever had this problem before?🤔


And what is your csc..?SLK..?

Settings > Abouy Phone > Software Informations > service provider software version..

[Humpty14]

Only after the reset, I got my services and phone back to normal.