sell-phone 

A cell phone or mobile device which advertisers uninvitedly use to sell things to cell phone users by sending them text messages but also popping ads on the interface, especially when users are surfing the Web.

Some advertisers uninvitedly turn my cell phone into a sell-phone, an S, E, L, L phone.

sell-phone by but for July 19, 2018

Sell phone 

A cell phone a person buys, initially with the intention of using it, but which ends up being sold within the month for drugs, etc., and which leads to a cycle of purchasing such phones

"He said he needed $80 for a cell phone, but he ended up selling the phone within a week to pay back a dealer. I guess he thought it was a sell phone."

Sell phone by mercurywoodrose August 31, 2012

selphone 

That's how teenagers write "cellphone" nowadays. Because, y'know, it's used for selfies more often than for calls.

Where's my selphone? I need to take a selfie next to my passing grandma!

selphone by KenM April 29, 2016

shellphone 

The device that sea creatures use to communicate long distances.

shell (n.) Look up shell at Dictionary.com

O.E. sciell, scill, Anglian scell "seashell, eggshell," related to O.E. scealu "shell, husk," from P.Gmc. *skaljo "divide, separate" (cf. W.Fris. skyl "peel, rind," M.L.G. schelle "pod, rind, egg shell," Goth. skalja "tile"), with the notion of "covering that splits off," from PIE base *(s)kel- "to cut, cleave" (cf. O.C.S. skolika "shell," Rus. skala "bark").

phone (n.) Look up phone at Dictionary.com

1884, shortening of telephone. The verb is attested from 1889, from the noun. Phone book first recorded 1925; phone booth 1927.

Crab: "I wish I could talk to Dolphin but he's visiting the Atlantic Ocean."
Fish: "Here just call him on my shellphone!"
Crab: "Thanks!"

shellphone by Scrat2o2 November 15, 2011