does the phone portion work? are you able to make and receive calls?
for the apk, if it's not set correctly, the apn will disappear. make sure all the settings in the apn are correct per:
Quote:
Sometimes this is caused by incorrect or missing APN settings. When Android boots up, go to Settings -> Wireless & Networks -> Mobile Networks -> Access Point Names. You should see an entry with Name: Android (or CDMA Generic), and APN: internet. If this entry is not active, activate it. If you see nothing, hit menu (the button with the house), create a new APN, and put in the settings Name: Android and APN: internet. Everything else can be left blank/default.
If you are on a network that uses login name and password for #777 dial up networking, and none of this works, you can try the instructions here, which may or may not help (you'll need your correct name and password).
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and try again.