iphone 4 newbie

[ste-i4]

hi guys and girls well ive just joined modern technology and have ordered a new iphone 4 on o2,ive never had any iphone before so im a complete novice,my current phone is a sony ericcson satio but tbh i got tired of software issues,and no support from sony reguarding the phone software,so i should have the phone within the next 2 days