C5303 NO SIM PROBLEM

[Rickycoast]

A client's C5303 phone doesn't read sim but when I remove the sim from phone it shuts down indicating absence of sim. What could be the problems, how can I solve it?

[Uliwooly]

@Rickycoast 

Could you test a different SIM card? 

[Rickycoast]

I've tried 4 different sims, still the same problem. Could the problem be with the card reader or is it software related?

[Rickycoast]

There was also post about rooting and various apks for various phone. I tried using towelroot as advised but it also failed.