Problem texting on my iphone 5?

When I text on my iphone 5 I type in one word wheni move on the phone changes it to another word how do i change the settings on the phone to stop this?

How to make your youtube videos available on your iphone?

I uploaded a vid on youtube but I can't watch it on my iphone, it only gives me the option to put it in my favorite or watch later… So I tried to edit the video and it says Syndication No, this video should not be available on mobile phones and TV. How can i change it to allow the video to play on mobiles?

Stolen iPhone help! (find my iphone app)?

My iphone was stolen and I'm trying to find it using the find my iphone app. ONLY, my iphone is off. I know that it can't be tracked down when its off, so I wanted to know if I'll be able to see it from the app in my ipad (which shares the same account my iphone has) once it's turned on. It says that i need Wi-Fi to send a message or to make the phone make a sound, but does it need Wi-Fi to be able to be tracked? I know that alternatively to the Wi-Fi, you can also use the data plan, but once my phone is turned back on, the person will have to insert the pin, and because they won't know the code, the phone won't be active. Do you have any suggestions as to what i can do? Will i still be able to track down the phone even without Wi-Fi or the data plan, that is, by only having it on?

Why can't my iphone sync to my computer?

The other day, I cracked my iphone and it wasn't working, so I ordered a new one.
The problem is, I now have a different computer and my old Iphone won't sync to it so I can back it up for the new one. Why can't I sync my old iphone to my new computer? What do I do?

Can i change the sim in my iphone 4?

Just got an iphone 4, to activate it It says I need a sim card, i've got my dads one but once i put it in can i take it out, get my sim cut and then put it in, or do i have to wait.

Texts messages not sending after iPhone update?

I updated my phone two days ago. Last night my phone stopped sending & receiving texts. I was able to text one person, but everyone else I couldn't. I wasn't even getting a notification that my texts didn't send. What should I do? (I tried turning off iMessage & shutting off my phone, then turning it back on, but that didn't help).

Problems copying videos to iPhone?

I have taken some videos with my Galaxy s3 and tried to copy them to my iPhone but iTunes will not copy some of the videos and it says that it is because they can't be played on the iPhone. Why can some be played and some can't be if they are taken from the same device. And how can I copy these unplayable files (they do play in iTunes though).

Thanks in advance

Added (1). Thanks for the quick reply but their format is already mp4 and the majority of the videos did copy. Why is it that some are playable on the iPhone and some aren't?