OK, if your character is making a 911 call, then yes, show the network logo on the phone:
However, if your character is arming an explosive device via his cell phone, then no, do not show any branding:
Lastly, if a mobile phone is being used to detonate explosives, take the whole faceplate off just to be sure we don’t imply that mobile phones can do anything bad:
(Why oh why can’t I just enjoy some television like normal people do?)
Tags: 24, mobile, product placement