Hey guys! So, I can clearly see this "Your SIM card does not allow a connection to this network" problem is quite common around here, so here we go. After one year of normal use, I got my problem one day ago, no connection whatsoever since then. Tried shutting it down, removing the battery and switching back on after 20 minutes. Tried my sim card in another phone - Works fine. Tried another sim card, from the same operator, in my phone - Works fine (WTF) I then called my operator (it's a Brazilian operator so no matter mentioning it now) and of course, no solution. Payment is fine, everything normal. So I wen't to my operator store and replaced the sim and... Still doesn't work! I then borrowed a sim from another operator and... Nothing! No signal! And just now, I realized that, when I change to "GSM Only" it works! The thing is I have an unlimited 3G plan, and use it a lot, this is not a solution for me. I've always used my phone on "WCDMA Only" or "WCDMA Preffered", but when I switch to those, or to anything other than "GSM Only", it dies, no signal, even with GSM Auto... I tried hard resetting, nothing helps here... I have no idea what to do next. When on WCDMA Only: Signal Strength: -71 dBm 21 asu GSM Service: Emergency calls only GPRS Service: Disconnected Network Type : unknown I bought the Phone brand new on eBay (or rather a brazilian version called Mercado Livre) and it's clearly from the UK (i can see from its plugs) but it's unbranded and unrooted, but unlocked. Also. I heard this may happen with stolen phones, blacklisted IMEI's... How can I figure this out? And how does that explain the fact it works under GSM only?