If I change ICloud accounts, will all of my pictures be deleted?

Up until now I have been using my dad's ICloud account on my iPhone. (Ever since I got my iPhone) He just changed his password and doesn't want me to use his account anymore, so I'm going to start using mine. I've been told that the only way to do that is to delete his account in the Settings app on my phone. Now. If I do erase his account and enter mine in, will it erase All of the pictures from my phone?

Does Imessage still work with just Wi-Fi?

Am I still able to send messages to iphone user, when I'm connected to Wi-Fi? I bought a iphone from a friend & I was trying to see if it was stolen I heard if the phone was black listed it won't be able to send messages through Wi-Fi or any at all that true?

Why do i have no memory on my iPhone?

So I have an iPhone 4 with 6gb of memory. I have about 40 pictures, 4 apps, and no music. Yet I still have "no storage". I noticed that when I go to the App Store and click on an app I recently had, it says install. Like it's already downloaded. And when I hook my phone up to iTunes most of the storage is taken up by "other". Do you guys know how I could clear those old downloaded apps off my phone? Also, do you have any idea what this "other" storage is?

Storage almost full on iPhone 5?

I got an iPhone 5 for Christmas and after the most recent update I've been receiving a message that says 'Storage Almost Full, manage your storage in Settings'. I have a little over 200 pictures and 300 songs, and the biggest app I have is Instagram. I share an iTunes account with my mom and my younger sister, could that be the reason that my storage is almost full?

How long does an iPhone battery last with iPod playing?

I'm a new iPhone user and I'm about to go on vacation via a long 13 hour bus ride and was wondering how long the iPhone could hold its charge if I'm listening to the iPod on it for most of the ride? By the way I have the first version of the iPhone not the newer versions.

Flash on my iPhone 4 isn't working?

I went to go take a picture yesterday, with flash, and the flash won't work. I even tried going on my flashlight app, and the light won't turn on at all. Any ideas why?

How to sign in with my apple ID?

Okay so I've made a new apple ID. I've signed in with it on FaceTime on my macbook successfully. However when it comes to signing in with iMessage on my iPhone the message comes up "could not sign in. Please check your network connection and try again."
I don't know why it won't let me sign in!
I'm signed in with a DIFFERENT apple ID on my iCloud. Could this be why?
Also if I sign out of this iCloud account and in with another one, where does the stuff back up to?

How to fix my Nike Fuel Band?

I just got an Iphone 5 today, and I was trying to pair my Nike Fuel Band up with it, but my Iphone can't find the band via bluetooth, I click the sync button on the band and everything. My band was synched on my Iphone 4 but I made my Iphone 4 forget the device. Anyway to get this fixed?