Hello! It seems like you're having trouble with your Redmi Note 8 not reading SIM cards or activating them even when there's a regular load on the SIM. This could be due to a few reasons, such as a faulty SIM card slot, software issues, or even a hardware problem. Here are some steps you can try to troubleshoot the issue:
1. Restart your phone: Sometimes, a simple restart can fix minor issues with the phone's software. Turn off your phone, remove the SIM card, reinsert it, and then turn on your phone again.
2. Check the SIM card: Make sure the SIM card is inserted properly and that it's not damaged. Try using the SIM card in another phone to see if it works.
3. Update software: Check if there are any software updates available for your phone. Updating the software can sometimes fix bugs that may be causing the issue.
4. Factory reset: If the problem persists, you can try doing a factory reset on your phone. Make sure to back up your important data before doing this as it will erase all data on your phone.
If none of the above steps work, it's possible that there may be a hardware issue with the SIM card slot itself. In that case, it's best to take your phone to a reputable repair shop or an authorized service center for further diagnosis and repair. The cost of repair can vary depending on the exact issue and the service center you go to.
I hope this information helps you resolve the issue with your Redmi Note 8. If you have any more questions or need further assistance, feel free to ask.