My iPhone 3GS keeps losing signal?

I have a iPhone 3GS 5.1.1 bb 6.15.00 which is jb recently been having a problem that I have no signal or 3G while in the house but do when I go outside any ideas

Maybe your antenna is just weak. Or try restarting or put it in DFU mode. 1. Turn off phone 2. Hold powerbutton for 5 secs. 3. Without letting go of it, hold home button. 4. Then release the power button and just jold home until it just turns off. Then try turning it on again. Hope this helps!

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