There are three "levels" of texting available on a family plan - per message - a bundle of 1000 texts per line - or unlimited on all lines on the family plan. Per message is 20¢ per message, sent or received, the bundle is $10 for 1000 messages for each line you add it to, and it's $30 to add unlimited texting to all lines on the plan. For our 5 phones, it's a no brainer to py $30 for unlimited. For two or three lines, you can look at individual usage and see if it would be less to have the bundle of 1000 per line or pay per message.