what will I do?

Early this morning i woke up and noticed that my cell phone isnt alarming because i set the alarm at 4:30 and when I look at my watch it is almost 5:10. I wonder why I havent heard the alarm. so, I tried to set an alarm again but my phone just keep vibrating without any tone coming out. Ah!? my phone have a damage. Now, Im thinking whether to buy a new cellphone or go to shop to repair it... what will I do?