How to get rid of all the 'Other junk?

I have an iPhone 4 and almost all of my usage is being hogged by the mysterious "Other" category! It's preventing me from using my phone in the ways I want to! What is all that stuff and how do I free up some space on my phone?!

Does something like Assistive Touch exist for computer?

Assistive Touch is a thing the iPhone has if you didn't know, it basically has all of the features in one little thing that is on your screen in case one or more of your buttons on the phone breaks. Look it up if you don't understand.
Anyway, my keyboard mouse's clicky thingies have broken, and my external mouse decided to give out on me too. Is there anything like this I can use temporarily that will allow me the right click option where through different keys or by tapping it with my touchpad on the screen?

Why can't I connect my tmobile iphone with metro?

Why can't I connect my tmobile iphone with metro?

Added (1). Why can't I connect my tmobile iphone with metro? So I first called and customer service told me they can connect any tmobile phoneor any at&t phone. After purchasing a tmobile iphone from someone I eent to connect it and metro says they can't because it must be unblocked? Why is this hzppening if they said they could do it. I already contacted the guy and they denied the unblock because his contract doesn't end until October. What can I do to connect it besides waiting?

How to delete many pictures at once on an iphone 4?

So I'm trying to get more storage on my phone and take off things that have a lot of space. Is there any way I could delete many pictures at once on my iphone. I have an iphone 4 and I have any pictures on my phone, prob around 2,000.

Netflix on chromecast stuck at 25%?

I'm dogsitting for someone who had chromecast it worked great in one room but when I brought it into the living room it would stop every few minutes to try and load and it will stop at 25% and stay there for a few minutes. It's getting really annoying. Btw I'm using my iphone to play netflix.