Hello I am having an issue sending text messages. I am hooked up to my wifi and I can go online with no problem but when I try to send send texts it keeps saying message not sent. I don't understand how this is a problem when im hooked up to my wifi and everything else works. What should I do?? I can get messages but can't send. Also it keeps saying my my phone is roaming although I am hooked up to my wifi. Help please!