IPhone 3GS settings for Three UK

I have an iPhone 3GS on Three UK.
How can I check that I have the right settings for this network?
I use both wifi and 3g to contact and roam the web, get emails etc.
Occassionally I get the odd message telling me that the phone cannot make contact with the internet.
I also use the phone tewthered to my iPad2.

If the iPhone normally works ok
when you get the message switch into Airplane mode for a few seconds
Cures mine in similar situation

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