My phone does not install any SIM card inserted into it, it does recognize it is there but it does not connect to the mobile network, when I log on to my account on my service provider online, it recognizes that the SIM is inserted into the phone. I have tried inserting it into another galaxy ace - s5830i, but it installs the SIM and allows phone calls to be made. I have inserted another SIM into my phone again it does not connect to the mobile network. Therefore I know that there is nothing got with the SIM. What I have tried to do so far is turn of my phone completely and I have reset my phone to factory setting numerous times. I have done a hard reset. All the forum threads that I have seen, people have rooted their phones or done something to them which happened to be the cause and the solution was to simply remove or undo these modifications. I havent made any modifications to the system, I use my phone for making calls and sending text messages and installing apps from the Google Play store. Also when I type in *#06# the IEME number does show up. Does anyone know why and how can I solve this problem.