Hi Geeks,
The problem is that the ALPHA 3G APN settings on iphone are suddenly deleted, especially when going to an area where there are no coverage and after getting back to a covered area my iphone will not get the 3G back and the APN settings are disappeared.
After calling alpha a million times and doing a million network resets (didn't fix the problem) i found the solution on apple's support forum so I thought I should share it.
The Process is to create a configuration profile whcih will make the APN settings as they are built-in with IOS so even a reset will not remove them.
check it out at:
http://support.apple.com/kb/ht4839