The phone is out of warranty so I looking at options.
I see that the simcard/sd-reader is very simple to replace.
Do you agree with me that the simcardreader is probably to blame? What else could it be?
My S4, i9505, pops up an error every now and then. It says "Unable to register simcard on network. Reboot now. When I reboot everything is fine, but it happens perhaps three or four times a day. There is no pattern to it, and I have ordered a new sim. After installing that the problem still happes.