Any help will be much appreciated! I have a Samsung Galaxy SII GT-I900P on Android 2.3.5 Gingerbread.XXKJ4 on a 24-mth contract with O2, I've had it for just over a year (just weeks out of the warranty). I have not altered the hardware or software in any way. It has not been damaged. So I have been very surprised and incredibly frustrated as 48 hours ago I stopped getting 3G/any network. I can use Wi-fi. When I try Settings-Wireless and Network-Mobile networks it says 'Insert SIM card to access network services'. My SIM is fine - it works in other devices. Other working SIMs do not work in my Galaxy S2. The phone has: 1. No SIM (though working SIMs inserted) 2. No IMEI/unknown number/mobile network state - disconnected. 3. Unknown baseband. 4. Cannot connect to Kies via USB or wirelessly - 'connecting' message ticks over for an eternity. My PC, however, picks up immediately that my phone is plugged in. 5. I cannot connect to Kies, so I can't update the firmware. Who knows whether this would help anyway. Can't rule anything out though. 5. I have undertaken a handset hard reset. Twice. It does not seem to wipe all my data - some of my photos are still on there. 6. I have tried GSII_Repair with Root and Basebox. No joy. 7. I have tried these things with both low and full battery charge. I searched online all day yesterday for solutions. Seems I am not the only person with this Samsung S2 SIM error. I am at last ditch efforts now - tempted to stick the phone in 12 socks in a tumbledryer, like one advice forum suggests! So any other ideas very welcome!