Mobile Phones Swapping from Blackberry to iphone ? Sim, network etc ??

Hi

I currently have a Blackberry and an awaiting an iphone, i am on o2 network. I have enough mins and txts and 500mB for berry data.

Do i need to ring o2 to inform them of the change ?

Will they charge me for micro sim or shall i just trim/cut existing one ?

I have 500mB will this be enough ?

Is there any way to monitor how much data i use so i don't go over the limit ?

Cheers

Dont need to ring O2 but you will need to trim your sim, there are various guides online just search or you can buy a sim cutter on eBay if you don't feel comfortable (that's what I did)

In the iPhones settings you can see how much data has been sent and revieved or you could download the O2 app from the app store (I assume this will tell you as the vodafone one i have does)

As for data I have 500mb aswell and I've never gone over I use my phone for Facebook push emails and a bit of web browsing / YouTube