International SIM card for iPhone 5?

I know my network would still work when I'm out of the country, but because I'm traveling to London next month, would I purchase an international sim over there to avoid extra charges? If so where would I purchase one and do they install it into my iPhone 5? I have tmobile by the way.

Why is my iphone 4 screen White?

Ok so i replaced my at&t iphone screen and followed all the youtube steps but at the end my screen is white and can bearly see the apps and stuff. What can i do.

Download iphone app which was free?

I had downloaded an app which was free after playing a bit i deleted that app

Now that app is a paid app and i want it again how do i get it without using backup from phone itself.
I had heard that once downloaded you can redownload it any time you want without paying it again

Forgot password lock for iphone

Ok so my mum and I had a massive fight last night, and you know how easy iphones break right? Well she tried to get it off me to go through my messages so I put a lock on it, but because iv been so stressed out I forgot the lock for y phone, what do I do? Is there any easy way to un lock it?

How to return an item from Amazon?

So I ordered an iPhone 4 from Amazon and when I ordered it, the details said that the camera was messed up, and had scratches. Fully aware of this I ordered the phone anyway. But when I got it the home button was messed up and Iv'e done everything to fix. Looks like I can't. So Iv'e decided to return it. I looked on Amazon and It said I can get a full refund if I return the item within 30 days and If it is not opened. I opened and I want a full refund. Is that possible? It didn't say the home button was messed up in the description. Also I emailed the seller and they said they will process the return request. What does that mean. I need their info to ship it back to them. When do I get that? Where do i get it? Will I get a full refund for the opened package? Its perfect nothings happened to it since i've opened it… It was just the home button didn't work at all when i opened it. I'm sort of new to Amazon.

What do you do when your app on your iphone is stuck on waiting?

One of my apps on my iphone 4 is stuck on waiting on my home screen. And i deleted the app on my phone by going to Settings > Usage > Show all apps > and then i clicked the app that was stuck on waiting and clicked Delete App. And then i turned my phone off and turned it back on and on my home screen it still has the app stuck on waiting, even after i deleted it. So i went to go download my app again in the app store to see if it still shows i have the app and the app says i'm still downloading the app. But when i go back to Settings > Usage > Show all apps and stuff it says that i don't have that app anymore. But clearly on my home screen its still stuck on waiting. What do i do? Please help! I'm literally so frustrated at my phone.