A:
Both of those are different types of plans that AT&T offers. Mobile share is a plan that allows you to share mobile data between multiple lines on an account. "Nation talk" may either A)Refer to the size of AT&T's network or B) The Family and Individual plans that AT&T offers.
- Both plans come with unlimited Mobile to Mobile (even between carriers) and then the Family and Individual plans come with unlimited Mobile to Mobile and then a set amount on Land-line minutes depending on which variation of the plan you choose.
To answer your second question, unlimited texting comes with the Mobile Share plans. For the individual plans it is priced at $20/month, and for Family plans everyone can receive unlimited texting for $30/month.