Why can't I text or call one person?

Me and my friend both have an iPhone 6, and he can text me, but I can't text him. When I text him it doesn't deliver, so I click 'send as text message' and he doesn't receive that either. I can text other people fine, but not him and I can't figure out why. I also can't pick up Facetimes from him which is also an issue.

Does Iphone GPS app have audio?

Just signed up for UBER and will be using old 4s Iphone for time being.

Do the mapquest or uber app come with voice GPS? Makes things easier.

Sorry I'm old

What is taking up so much space on my iPhone? - 1

Under my settings, it says I'm using 11.61 gigabytes, but when I did the math and added up all my apps, I got about 5 gigabytes. That's less than half what it says I'm taking up. What is taking up the rest?

What size case would fit over an iPhone 5c with an otterbox?

I have an iPhone 5c with an otter box. Not exactly sure which kind but it's got a two piece plastic case with a rubber case over it… What kind of case would fit over my otter box? I just want one of those cute fuzzy ones but I'm not sure if a iPhone 6 or 6s would work?

Added (1). I understand that phone cases are designed to go over the phone not the case but i just want to know if anyone knows if I could put one over my otterbox so I don't lose my otterboxes protection. And if no one can answer that then does anyone know if a iphone 5 or 5s case would fit on a 5c

How to use iPhone 5s in a 2008 Volkswagen Jetta S?

For my Birthday I received a 2008 Volkswagen Jetta S. When I checked it out I noticed that there wasn't an aux cord slot, but there was an iPod adapter/console in the arm rest. I do not own an iPod 4 or iPhone 4, I only have an iPhone 5s. Is there any simple way that I can use my iPhone 5s in my car (for audio & charging purposes) without having to remove things from my car (for example, the stereo)?

***I attached a picture of the iPod adapter/console*** How to use iPhone 5s in a 2008 Volkswagen Jetta S

Looking for an specific app for iphone?

I saw an app on someone's iphone and i'm looking for its name.
its could recognize anything you have by taking a photo from it. For example you take a photo of a bottle of whisky and it gives u all the information about it
anyone knows the name of that app?

I'm pretty sure I have purchased a stolen iphone

I'm pretty sure I have purchased a stolen iPhone. But I'm still trying to get into it, it says " this phone is linked to a Apple id. Enter the apple id and password that were sued to set up this iPhone". Is there a way i could hack this and maybe get the phone to start working? I already tried to take out my own sim card and put it in this phone it is not working. I told the person i bought it from that it was not working and he told me that he forgets his apple id but i'm pretty sure that this is a stolen device. None the less i still paid for the phone and if he is not the original owner i have no idea how to contact them and at the end of the day i still need a phone eventhough it is morally wrong. ( SORRY) . Could anyone give me any advice on how to get into this phone?!