Here is a list of actions to take to try to fix a frozen phone:

1. Attempt to power off the device. Press and hold the power button for a long period of time. If successful, the device should shut off.
2. If that does not work, try removing the battery and SIM card, if applicable to the device. Wait at least 15-30 seconds, then replace the components and attempt to power on the device. It should begin functioning normally.
3. If the device will not respond, or continues to freeze up, connect the device to a computer to restore the device to factory settings and attempt to use the device.
4. If the device will not power on, or continues to malfunction, consulting a qualified technician with the device may be the best option.