Iphone 4S buggy with phone calls-is it Apple or the carrier?

Question

I have a carrier that has bad signal, and will be switching carriers later this week. However, this issue is new-I'm not sure if it's connected to the iphone or if it's somehow tied in with the carrier's lack of signal strength. It has only been occuring since the last update, so I am thinking that it's apple
When trying to make a call, my phone freezes to the point where the contact id photo is blurry, but no call time or end call option come up. I can't end the call from the screen. I switched my settings so that I can end a call with the lock screen button, but when I try to do that, it pulls me to the home screen (extremely delayed), and if I try to click on the green bar at the top of the screen to go back to the current call, nothing happens.
Sometimes there is no audio, I can't hear the person I'm calling or the person who has called me. That could be just the carrier, but the freezing up is abnormal. I can't make any phone calls or send/receive texts right now. When my signal is great, the phone is buggy, freezing, closing, etc, so I think it's a mix of both my carrier and the update.
Any advice is welcome,
Thank you!

Answer 1

"..Is it actually possible to share my purchased apps to my hubby"
Yes.
"Or can we actually share the same apple ID?"
Yes.