Have you try to reset your device?
If you have an Android, please complete the following steps:
1. Please press the Phone icon
3. Enter ##72786#. Last # entered will not show on display
4. SCRTN appears briefly.
5. The phone will power off then power back on.
6. The device will complete the Hands free Activation steps, to program the phone. Will update the PRL, and power off and back on again.
If you have an iPhone, please complete the following steps:
1. Tap Phone.
2. Tap Keypad if necessary.
3. Enter ##873283# then tap Call.
4. When Starting Service Update screen appears, tap OK.
5. When Service Update Complete appears, tap OK.
As it says I just joined and made my payment on top of that. It says I have nothing due, but I can't make any phone calls. What am I supposed to do?