[It hasn't even occurred to Bartz that popping up suddenly in front of people during a big battle might be a bit... startling. Or that any of his allies would be suspicious of such behavior.]

Yup! Here.

[He tosses Sephiroth a small device that resembles a flip phone.]

I nicked that off one of the enemy officers. They use 'em to talk to each other. I couldn't think of anything to do with it though, but I figured maybe you military types could use it?