got a new iphone and had it unlocked to use my vodafone sim. been using with a blackberry pearl where i am subscribed to internet and email. iphone wont give me these things. when i put the sim back into the blackberry the email and internet work perfectly. fed up of continually swapping sim from one to the other. keep hearing about something called "edge". what is this? ps. im not up on all this phone jargon so if you have some info that might help i would appreciate no technical stuff if thats possible thanks.