TDA Rules prohibit talking on a cell phone during play. Use of other electronic devices is up to the individual house. Personally, I do not believe a player should be allowed to use any type of device during play. However that is not the position of the TDA.
My suggestion is that your house rule should prohibit the use of any type of device, during play of a hand, that could be used to give the player any advantage during a hand that player is involved with.
In prior years, the TDA rule prohibited use of any electronic devices, but there arose such a clamor from players that needed to post to Facebook or Twitter that the TDA rule was changed.
Chet