How many current iphone users are there?

I was just wondering if anyone knew where I could find out how many people have an Iphone and access the App Store. I imagine its in the millions, but I'm not sure. For clarity: I'm only interested in knowing about versions of the iphone that came out since the App store came online.

There's no Assistive Touch on my iPhone

I have an iPhone 3g and my power button on the top broke and is unable to use. I heard there's something called Assistive touch and i can get it by going on settings>general>accessibility but there's no Accessibility option. Is there a way i can get it?

Can I upgrade from the Droid 2 to the IPhone 4?

I currently have the Droid 2 Global with Verizon. And my 2 year contract ends in December. Maybe I can upgrade to an Iphone 4? I have been sharing a plan with my whole family and we all are getting new phones In December. Would it cost too much to share a plan and have 5 people in my family get Iphones?

What to buy with 1000 dollars?

I recently got 6, 000 dollars and I decided to put most of it away in a bank account but I wanted to spend 1, 000 on something. I do not not know what to buy with it… I'm 18 and have and laptop and iPhone so anything else is ok

Why does my iPhone run slow?

I have an iphone 3G currently on 3.1.3. I downgraded from ios4 because it was running incredibly slow, so I decided to downgrade to 3.1.3. But it is still slow with huge lag times, when opening an app.
What shall I do?
I have tried hard reset as well to no avail…

Can you put an iPhone 4S in an iPhone 4 case?

On websites they always sell the iPhone 4 & 4s cases seperatley and I wanted to buy one online, but they all just say iPhone 4. Just want to make sure I for sure can just in case!