I posted a deal exactly like this a while ago but as the phone company wasn't known a lot not many people liked it. Now Bestbuy Croydon (Someone please confirm if it is just Croydon) are doing the same deal but better!
£20 a month (24 Months) gets you:
-FREE Blackberry Bold 9700 (Black or White)
-Unlimited Blackberry Services
As Bestbuy is only an in-store merchant for now, it is only in-store. It is in the brochure for Grand opening deals (It opened yesterday!) which is meant to last until Sunday, but I am not clear if this will last longer than that. It is an amazing phone, I have the exact same contract except it was from my old deal. If you are worried, from my experience with this exact contract, it will last longer than you think unless you are on youtube every minute! Blackberry's are becoming ever so popular, and with Blackberry Messenger, you can utilize that fact with the free messaging, voice sending, and picture sending that comes with a Blackberry!
SORRY FORGOT TO ADD IT IS ON ORANGE, AND SEEING THAT T-MOBILE ORANGE MERGER HAS COME ABOUT, GOOD SIGNAL WILL BE ENSURED!