Can i use my US iPhone in Canada for vacation?

I don't want to use it for text msgs. I want to use it to iMessage ONE friend. I'm going to turn of voice roaming and data roaming. I will also turn off the data every single app on my iPhone uses. Can i still keep my 3G on to iMessage someone or will i be charged international costs?

Is updating to ios 7 worth it?

I still have ios 6 on my old iPhone 4s because I like it a lot. I haven't updated because I think that ios 7 is ugly. But lately I have been curious as to what ios 7's unique features are, and I want to know from people who actually have had both ios's.

So, what things are definitely better in the new ios? What things were better in ios 6? Do you think it's worth it to update enough to deal with the ugly layout? I appreaciate everyone's opinons!

Iphone service warranty and accidental damage?

Iphone service warranty and accidental damage?

Added (1). I bought an iphone c from target about a month ago, I accidentally dropped it and it popped out of the shell. When it did half of the screen started to turn green and when i popped the screen in it the whole screen turned green and now the screen does not work at all. If I take my phone to apple will the damage be covered under the current service warranty?

Why does it say not available when I FaceTime?

I iMessage a friend & when I do it turns green instead of blue because we both have iPhones. And when I call it doesn't ring it goes straight to voicemail. Also when I FaceTime him it says his name & "not available for FaceTime" I do t want mean answers please!

Does it seem he isn't interested anymore?

My boyfriend and I have been together for eight months and lately he ignores most of my texts messages but is on Facebook. He has an iphone so you know when you get a text even when you're on facebook. He's been with his friends a lot on his days off but doesn't seem to want to be with me much anymore either. We hangout like every other day and everything is great then but when we aren't together it doesn't seem like he cares.