An easy way to reproduce the signal loss in iPhone 4.

[thornguy]

Could it be a grounding issue with the metal?

 

[paperboyCCC]

Mine goes from 5 bars to 1 if I touch the phone anywhere indoors. Only way to make a good quality call is with Bluetooth.

 

[alecgold]

Mine goes from 5 bars to 1 if I touch the phone anywhere indoors. Only way to make a good quality call is with Bluetooth.

Try à bumper or a piece of cello tape. If that helps your hands might be a bit more acid than normal. This helps conduct the signal from the gsm to making your body a big antena. But your body absorbs to much.
Some latex gloves kith help as well.
I just don't get why you would only get it indoors, unless you live in a snowy area and wear gloves outside

 

[jalpert]

No signal loss here. Besides, what's the big deal? If my phone lost signal when it shouldn't, I'd call apple or make a genius bar appointment and get a new phone. Phone broken, get a new one, it's not rocket science.

 

[TroyBoy30]

no change for me

 

[ohio.emt]

No signal change for me even if I cover the whole bottom with my hands and half the sides.