Vodafone are very sympathetic towards students @ansshabbir , and offer a student discount here: Student Discounts
It would be worth mentioning that the device part of an Evo contract is a credit agreement. There is further information here Evo,
The other alternative is to purchase your own phone and go SIM only here: SIM only
If you don't want to be tied into a financial commitment, PAYG is looking good here: PAYG
Certainly worth taking a look at Voxi, great for students with unlimited social media here: Voxi
