screen has froze on me ?

hi ma samsung tocco-lite has froze on me it wont let me scroll through ma 4 it lets me answere ma 4 and lets me 4 people aslomg as its the sameperson who 4 me as it dose not allow me 2 scroll through my 4 ive taken the bat and sim out but it hasnt made a diff its a gt-s5230 had it about 2years never had any drama with it afore