Well firstly am not too happy about this to begin with but she insisted that she borrow it for a day when she goes out to a friends party etc, anyways my Q, i have a Telstra Next G sim, and she has a Vodafone next G sim , if i swap sims will i lose any of my email settings etc, will it screw up more??
No, you won't lose anything on the device, but she won't have data access, internet, etc., unless she has a BB Data Plan on here SIM account, and IF the BB is unlocked for use on Telstra.