Hi. I'm trying to mass send texts (about 100 at a time) but as soon as I press send - every single one of them fails to send. It just fails and all of the messages just sit there in the 'undelivered messages' section. When I press 'retry sending all' it all just fails immediately, without even trying. I don't care if takes one hour, two hours, 12 hours, a whole day to send em all, just send them texts! What to do?