i have $4.50 on my phone i want to get 2 ring tones for 4 though i pay $25 a month and get 300 min and unlimited txt and web i got this thing in the mail so i only paid $10i got some ring tones but i want some other ring tones but i don't know what happens if i don't have any money left or if i have 0.50 cents left please help me