Lg g3 - messaging settings

[AC Question]

Lg g3 - when trying to send a text it says "messaging would like to send a message to (eg) 31696" "this might cause charges on your mobile account. And then a check box with remember my choice.

 

[B. Diddy]

Welcome to Android Central! Does this happen when sending a message to a regular phone number (like a friend's), or only with those 6-digit numbers that are usually used commercially?