I think the answer is surely not, but with cable companies you never know... The fine print for Mobile Share's Unlimited Talk & Text says: "Messaging applies only to AT&Ts Short Messaging Service (SMS) and Multimedia Messaging Service (MMS) and not to any other messaging services or applications. Messages are for direct communication between phones and must originate from your phone. Messages sent to tablets, laptops, or other connected devices are excluded. Messages sent through applications may incur data charges. Service may be terminated or restricted for tethered messaging or misuse." Is it just a case of outdated fine print or is AT&T going to do something if you text over Continuity?