I have an iPhone 3G and recently I've been unable to get reception anywhere except in outdoor situations and in my home. Whenever I go to library or go to class and try to text/call someone I keep getting a "Call Failed" or "Message Failed" message. Before, It was working everywhere I go- auditoriums,grocery stores,etc. now It's acting funny and wont let me call or text even in open buildings where other iPhone users and AT&T customers can text and call. Anyone know a solution?