Why won't my verizon iPhone 5 send messages to certain people?

I have a friend who has verizon and it sends messages to him very fast and I have friends who have different carriers and it won't send to them. The send bar keeps on going and stops at the last second. I have turned it off and on again and I have reset my network settings. Nothing has worked at all.

Verizon - Keep unlimited data plan but add new line?

I'm thinking getting iPhone 5 for my husband for X'mas gift.
I already have a phone with Verizon but he is with sprint right now and switching to Verizon.

Is there anyway to keep my unlimited data plan but add his new line to my account?
Or is it better to have separate account? I usually use about 2GB for my data. Is it worth it to keep my unlimited data or should I go with shared plan with him?

I kind of hesitate to drop the unlimited data plan because Verizon is not offering it anymore.

What do you think?

IPhone 5 no audio on video recording?

Whenever I record video on my iPhone 5 (back camera) the audio will play fine on the playback for about 3 seconds, and then just cut off. I have not yet tried putting the video files on a computer to see if this is the same as I do not have access to a computer.

How to get old texts back without backup?

My girlfriend has an iPhone 4S and recently i found texts on her phone that lead me to believe she's cheating. She claims the texts were texts that she deleted a long time ago because she just reset her phone and old texts came back. She's never backed up information though. Is it possible to get old texts back or is she lying?

Can I get an replacement for Apple's Lightning charger?

It hasn't even been a month since I got my iPhone 5, my Lightning charger broke, yes I've plugged it into different sockets and computers, and I tried a friend's charger and it worked fine, so I know that the problem is in the charger. When I plug in my charger I get no sign that the iPhone or my pc recognizes it, no icons pop up, no beeps, it's as if the charger wasn't there. Is there a way to fix it? If not does apple offer replacements, or am I screwed and have to buy a new over-priced charger?

Why can't i sign into game center?

I have a iphone 4 and everytime i try to get on a game i tells me to sign in and wen i put the information in and press sign in and i literally takes all freaking day to sign in and it still doesn't sign in i try to press close or create new accoun tand they don't work and also my email and safari not workingPLZ Help!