...connection. What wrong with it? I have tried selecting a network manually, but that still loses the network connection.

I have heard of that problem before. It is possible that there is a fault with the internal ariel. A good store can sort that out for you while you wait and drink some coffee.

Nothing is wrong with it....... i work for t-mobile and t-mobile does not have vey good coverage compared to other companies. So go on t-mobile.com and check your coverage area if it's not very good around where u live then switch to some other company but if the coverage is good where u live than call 611 from your cell phone and tell the customer service that your phone is not getting good service and they will send u another one for free caz u have one year warranty!