(mobile telephony) cellular phone, mobile phone, cell phone

long telephone conversation

to talk for a very long time on the phone

straight

directly

direct, straight, frank

sincere, straightforward, proper, frank / simple, not extravagant, not expensive, less formal

to do one's duty, be on duty

behind, after

(spatially) the back, the rear, behind / (temporally) later, afterwards, some time after the present / the rest