ITunes - The iPhone is synced with another library?

Hi! I wanna try to add music to my iphone 3, so this is what message i get -:
the iphone is synced with another library, Do you want to erase this iphone and sync with this iphone library? An iphone can be synced with only one library at a time, erasing and syncing replaces the contents of this iphone with the contents of this itunes library.

MY QUESTION IS IF I CLICK ERASE AND SYNC, WILL IT DELETE All MY PHOTOS OF THE PHONE(BECAUSE I HAVE 1622 photos) Please answer need it fastt

Why does my iPhone 4 run out of battery so fast?

I have an iPhone 4 with only 18 pictures and 28 videos. I have 10 apps aside from the apps that already come with the phone. I constantly delete pictures, videos, and apps that I don't want to delete just because of storage and it still runs out shortly after! Or sometimes it doesn't make a difference after I delete something! Why does it only let me have so little?

HP Pavilion P6000 Series Ethernet port not working after lightning strike?

Yesterday we had a really bad lightning storm that fried our modem, we got a new one today, but now my ethernet port isn't working. I've tried using different ethernet cords and they didn't work, so i tried them on different computers and they worked fine of the other computers. So today i went out and got a network card, but there's no slot for them in the back of my computer. I'm using my iPhone 4S 3G internet right now, but it is too slow and i'm using up my limited MB. Someone please help me fix the problem or point me to where i can get a new networking device for my computer.

My fingess pal app/ calorie intake?

I've recently been trying to use my finess pal app on my iPhone as a food diary and I've noticed it only allows me to have 1300 calories a day but I was told that's dangerous. Is this try should I be consuming more? On my good days I eat 5 times a day and I find that I don't use all of my calories. Is this bad?

Will I beable to put my sim card in an Iphone4?

So recently my blackberry 8520 broke and my dad decided to order me an iphone4 but he is going to take the sim card out of that and put it into his phone (not sure how but okay) this phone is from t-mobile and my sim card is tesco (on contract) i'm going to put my sim into the iphone but i'm not sure if i will need to get it unlocked or cut or something?

What network iPhone can I bring to Virgin Mobile?

I'm looking to switch to Virgin Mobile because their unlimited plan is dirt cheap. The problem is the iPhones are ridiculously priced. Does anyone know if I can somehow jailbreak a phone from ANY other network and use it on Virgin Mobile?

Black spot on iPhone 4S front lens?

Everytime I take pictures with my front camera, a dark spot appears, even when I'm recording a video. It just appeared randomly one day and I know it's nothing to do with lens because it looks like its sort of built in? So it must be a hardware problem. I take good care of my phone, I've never dropped it, not a single scratch on it and I've had my phone for a little over a year? I have no insurance and my warranty has passed so i don't know what to do it kinda sucks that I have to be stuck with this phone for another year and I can't get it replaced. Anything I can do?