Green’s Dictionary of Slang

a mobile telephone.

1997		C. Newland Scholar 121: You got me moby number, so gimme a bell dis week, yeah?
1999		Guardian 12 Nov. 35: I have to turn off the mobey after seven calls from Vic.
2000		N. Barlay Crumple Zone 40: Dennie’s mobile which is somewhere as mobis generally are.
2000		Guardian Media 6 Mar. 7: They have bigger front pockets (almost big enough to hold a moby, in fact).
2005		H. Mantel Beyond Black 334: If you leave your moby, I could call a cab.
2009		T. Black Gutted 6: I [...] pulled out my mobi and dialled 999.
2013		K. Sampson Killing Pool 235: I’m on my way [...] when the moby goes.
2015		I. Welsh Decent Ride 31: Ah’ve goat another Septic oan the mobby.