Jailbreaking iPhone 3G 4.2.1 BB 05.15.04 with PwnageTool

[RonP6]

I need I help I have an iPhone 3G 4.2.1 BB 05.15.04 I jailbroke it using pwnage tool and it didn't let me make calls afterwards was it because I did uncheck active since I on AT&T and I want to try again if someone helps that situation if I retry will it update my baseband if I just try to jailbreak not unlock help I'm just a noob that needs some guidance