Cant receive or send pictures or use apps without wifi HELP ASAP!!?

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I have AT&T on my Galaxy Note 2 and I have experience similar problems.

However, on my phone I have my settings to do everything over WiFi only... The thing is... when I am away, my phone immediately tries to search for a wifi signal first... so if I try to log into Yahoo Messenger or Skype when I'm away, it almost never connects because it's looking for Wifi first... I downloaded a WiFi toggle widget that allows me to turn off my wifi.. you can do that from your settings too.. then if you do that... your phone won't waste time searching for a signal first... that's probably your problem...