Does a iphone need a certain contract?

When i got my blackberry i was on a £7.50pm contract (it was the sim card and it was from another phone) and I needed to upgrade my contract because blackberry's need certain data plans or something? I've been looking at iPhone's now I'm wondering if i'll have to upgrade it again?

No Not Necessarly

It's wise to get a data plan for any smart phone (blackberry, android, apple, windows) as they constantly use the internet to update time and date, weather, emails, apps. An iPhone will work on the tarif you have now but you will be get alarming bills for data usage. 250mb is ok for someone who doesn't use much, facebook doesn't use a great deal, YouTube will run up a big bill very quickly. Wi-Fi will be free so use that if possible. If you want to use you iPhone without Wi-Fi and watch YouTube etc get a larger allowance 1gb and above.