Can anyone help: my iphone 4 says no signal all the time

Hey guys,
Can anyone help me? I have done a factory reset on my phone and ever since, my phone will not regester any signal what so ever.
It just says "no signal" all the time. I have tried to reset network settings on it, but that doesnt work. Ive also tried to change carrier as it keeps telling me "your selected mobile network is restricted, you can choose a different network in settings." so ive tried every other network there is, but up until I did a factory reset it was working perfectly well on O2 if anybody could help itd be much appriciated.
Thanks in advance
Sarah

Marc,
Here's my story. Received iphone 5.... went to verizon and had them turn it on to my account. On to apple store to buy apple care. Put on Zagg sheild cover in the mall. Returned home. Played with phone.. no service. Tried to call myself via house phone.. no luck. No mail box set up. Can't set it up if I cant use the phone. Bummed. Called Verizon. He (David) suggested I return the phone to Apple store. Made an appt at the genius bar for the next day. In the store I had two bars, gal next to me had 4 bars on Iphone 4s with Sprint, Guy across had ATT with 3 bars. Now I had a new phone. New one was great - now had 4 bars in the apple store. Left... went to ZAGG, reinstall cover sheild then to Verizon and had them set it up with my phone number. Worked great while out and about.
Get home -- no service. Bummed again.... I checked the Verizon map and I was on the cusp of G4/G3. My phone was reading -- "o" and flipping to no service. David had told me he would call me back later that day, after I made a swap of my phone. David did call and suggest I get a signal booster. I placed an order for one. It arrived in two days, set it up - easy - and waited for all the lights to turn blue.... WALAA! Called the special number and the phone works great from home.
I get G3 service at home and when I am out LTE service. Funny - the LTE service light comes on right when I am exiting my driveway to the road. But I am glad that I have service from home. David called me again to check on how things worked out. So far I am good with my phone and service.
Signal booster from Verizon was my fix. Hope my story helps someone in the same situation.

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Can anyone help: my iphone 4 says no signal all the time

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