Error Message No Network Detected

[Kelly Hurteau]

Hi I have a Samsung at&t Captivate glide with a BYOP Straight Talk Sim Card and when at home I get a message No Network Detected and can't receive or make or send calls or messages. If I walk a block down the street I get service off and on.I have been dealing with Straight Talk on the phone for over a week now and still no luck. If anyone has any suggestions please let me know. TY