It depends on your carrier. Some times your android phone has a option in the settings, tmobile doesn't block number. I would call your provider and ask them.
If your phone is not working, the easiest way to attempt to fix it is to turn the phone completely off and leave it sit for a few minutes. After you turn it back on, the problem may be fixed. If your phone needs a complete reset, which will erase all data on the phone unless it's been backed up, there will be a reset button under settings.
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To hard reset a ZTE prelude, go to settings and tap the "backup and reset" option. Select the "Factory data reset" icon and confirm the action. A hard reset will erase all the personal user data such as contacts.