Has been glitchy since Christmas, sending the same message 10-25 times simultaneously, not sending messages, dropping off line, etc. The Feb 14 update made it worse!! I no longer get ANY notification when I receive a message, no matter how many times I force close or what setting I change, instead when I open the app to send a message or start a conversation I am flooded with all the messages I've missed through the day!!! It's garbage and entirely useless as a functional messaging service!!!!!!