Can't connect to my phones internet?

It seems like everytime I try to do something on my phone like connect to the internet, use my phone as a modem or anything involving the phones internet I continuously get the Dialed: #777 message. why is this? does anybody else have this problem?

Error message:
Cannot connect for an unknown reason. To check your connection settings and change them if needed, tap Settings. If the problem contunues, reset your mobile device according to the manufacturer's documentation and try again.


Some more questions I need answers for:
How can I get MMS working correctly?
Is there a fix for landscape mode for any rom mainly Juicy R7 rom? (or will there be)