What's the error message that you are encountering when you try to send an SMS? Here are few things that you can do on your end to check what's the problem?
- Ensure that you have at least PHP 1.00 maintaining balance.
- Powercycle your phone (Turn OFF/Turn ON)
- Use the default messaging app on your phone.
- Insert SIM Card on another device, and try sending another message so that we can check if it is handset related
If the issue persist, I suggest that you get in touch with Globe's Account Specialist.
Hope this helps;