The first time I came across this problem was a week or so ago when I attempted to use my iPad 3 on a bus on the way into work. When I'm at home the iPad is on Wifi. At first no bars came up on the 3g indicator then eventually it went to full strength. I was unable to connect to the Internet throughout. I eventually powered the iPad off and it connected and the Internet worked as soon as the power up completed. I'd done the same journey many times with my former iPad 2 with no issues.
I thought this was a one-off but on my way home from work today on the bus (the iPad is on Wifi at work) the same thing happened. At first zero bars on the 3g indicator then eventually full strength. Despite this I was unable to connect to the Internet. I powered the iPod off and on again and 3g burst into life. Needless to say I have done the same journey many times with my former iPad 2 with no issues.
I've just done a search on Google and lo and behold there is a 3 page thread running on the Apple Support forum about this selfsame issue! .
Anyone else on the forum experiencing this ? I'm in the United Kngdom and I'm using a Vodafone contract SIM - the same SIM that was in my iPad 2, which I've now sold to a friend. Doh! As I said I've never had this problem with my former iPad 2 on the same journeys.