Hi I'm at my brother now using my ipad and connected to his wireless router and everything is fine. Now I've inserted the O2 Sim card what I chose when order the iPad. I've not had the sim card in be for and in the top corner next to the signal strength for the wireless signal said no sim card. now I've inserted the sim card it says O2 and bars at the side for signal strength. At the moment I'm using the wierless mode and not the sim card. When i leave to go home and get out of range of my brothers wireless range and will it auto go to the O2 sim card?. Will it also ask for password be for signing into The simcard?. If you need any more info on my question please ask. Thanks.