An update on my last post. I managed to get my phone to connect to WiFi but I had to be right next to my modem to get a strong enough signal. Could this mean an aerial problem?

I undertook the battery replacement and put a new charge port in while I was at it.

After putting the phone all back together and powered it up everything appears to work on the screen functions but the phone no longer reads the SIM card or recognises my WIFI. This has rendered the phone unusable. I have tested the SIM in another phone and it is OK. The phone recognises the SIM and does a restart but then does not read the SIM card once it has restarted and displays the message “No SIM card - Emergency calls only”. It is as if the SIM card reader is not working.

I spoke to a technician and he said he wears a wrist band with a wire connected a metal earth to eliminate static electricity in his body going through the phone and short circuiting it causing damage. Could this possibly what has happened to my phone as there was no mention about having the earth yourself while undertaking the battery replacement.

Does anyone have an explanation or solution to my SIM card not reading?