ok i just bought a motorola v300 mobile and when i go to use wap it says gprs network not avialable, now it lets me go onto wap thing still and i can look at pics and games to download but when i want to download it comes up with the same message.(gprs network not avialable)

is gprs not working because im using an old sim card?,because it came from a nokia 3330 which i had ages ago.if i use the sim card that was with the phone will this mean gprs will work then or is that not the problem?

its so annoying as the phone wasnt cheap and i cant do much on it without being able to download stuff.