S4 I9505 intermittently cant read or use SIM card.
My s4 normally reads my SIM card no problems, until about a month ago, when it started intermittently losing access to the SIM card, blocking it from the network and preventing calls. Sometimes a reboot would make it work again for a bit. I tried a few other SIM cards with the same results.
The strange thing is I find if I remove the phones back plastic chassis exposing the main board the phone reads my SIM card no problem, and will work continuously until I put the back chassis back on.
I also found if I carefully put the back chassis back on the phone, but leave one side not fully clicked in place, the phone still reads the SIM card OK, until I click the last few bits in place.
I bought a replacement back chassis and found that the phone works properly with it fitted, using other SIM cards. But once I put my own SIM card in it wont read it properly again. My SIM card works fine in other phones.
Any help or info much appreciated.
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