Is it normal that when I go to make a call it says no signal and that its in emergency mode...it usually takes a minute and then it works....it doesn't happen all the time but it's happened at least 5 times since I've had the phone. I ve had it for 4 days... It's a refurbished LG G3
Try this first before anything else: 1) Shut down the phone. Open the back. Pull the battery (if easily accessible). Pull the sim card. 2) Go have a coffee or watch something on TV (3-5 minutes). 3) If you want to be really productive, now would be a good time to change that screen protector that looks a little ratty around the edges. 4) Re-assemble and re-start the phone.
Let us know if this works for you or not. There are more steps we can suggest, but doing too much at once usually ends up complicating/obscuring things rather than being helpful.