FaceTime only works on Wi-Fi not on mobile data

I have Iphone 4 and I can't get FaceTime to work when I'm out such as when using mobile data (it is turned on). A message appears saying i need Wi-Fi to connect. FaceTime only works through Wi-Fi connection. Can you please guide me how to fix this.

My iPhone has a black screen with the white apple logo and won't turn on?

It goes from a completely black screen to a screen with the apple logo and then back to a completely black screen in about 10 seconds. I've tried holding the home button and the lock button at the same and nothing changed. It's been plugged in and has been doing this all night. Any ideas?

Update elements of iWeb site from anywhere?

I'm needing to update certain paragraphs of my iWeb site from other computer or even my iPhone from anywhere. So what i'm asking is does anyone know of a way to do this. I was thinking of maybe replacing the text boxes with html snippets and then pointing those to somewhere else that i can easily edit on another website or something like that.

Apple iPhone 5s or Sony Xperia Z1?

I'm about to get a new smartphone and I set my mind on getting the Sony Xperia Z1
as time gets closer for me to buy the phone
i'm starting to think twice about which phone i should get, now i'm also looking at the iPhone 5s

I wanted to get the Xperia Z1 cause of the specs inside and also cause its waterproof cause i live in a place where rain is almost everyday lol

but i don't know there's always something special about iphone
i've owned one

i've had blackberry's and iphones
this will the first phone with android ill ever owned
i've used them before (friends & fam) but haven't really owned one

Would like to hear your opinion on which you would get & why?

Can You Use your iPhone Oversize and Will there be Service?

Ok, My mum has an Samsung (Bought in Australia) and the Last time she went to Srilanka, Indian and All that, it had service from their Network and could Call! I just want to know, if my iPhone (Bought in Australia) will have service and to be able call in Srilanka? If not, what can i do?

What's your all time favorite Christmas gift?

As much as I love the iPhone I got back in 2010, it's second to the Nintendo Entertainment System I got back in 1986. My parents were going through some tough times back then. I was 5 years old and my belief in Santa Claus was waning. I was so jealous of all the other kids in my kindergarten class who were talking about how awesome Nintendo was, and bringing their games in for show and tell. Meanwhile, I was stuck playing my old Atari 2600 that I'd gotten for my 2nd birthday. I reluctantly sat on Santa's lap that year, and told him how good I'd been, and how much I deserved a Nintendo. Then I told him that if he was indeed real, why couldn't he bring me one? My parents were heartbroken, and come Christmas morning, by golly that NES was under the tree! I found out several years later that my dad sold his college ring to get it for me. I finally returned the favor a few years back by having a new one made for him. That's his all-time favorite Christmas gift.

How to delete songs on my iPhone using iTunes?

I deleted all my songs off my iPhone 5 manually using my iphone and shows there are no songs on it now that i plug in my computer it shows all the songs there and i can't use them or delete em or i can't even add more music too my iphone5, Help!