Pay your phone bill!!! I work in the finance industry and i see to many people with "default" on their credit file for not paying their bloody phone bills. Trust me it will hurt you in the long run if you dont pay it!!!!
Maybe you should look at the $79/cap. i think it is with vodaphone. doesnt matter how many calls you make your bill wont be over $79!!! Sounds like a good deal to me!!!