Arduino Due and Serial Connections

I am trying to connect both the SM5100B cellular shield (serial 3 on Due) and a puprletooth jamboree bluetooth module (Serial2 on Due). When both are connected to Due only the BT module works and the cellular shield stops responding. Both are connected to an external power source. Any idea as to why? Is the board unable to drive both together? How can this be resolved?

Thank you.

Don't cross post, you will upset a lot of people.


Rob

(deleted)

you are right. Sorry about that. I guess i can't delete the cross posts by myself...