Hi al..you can try booting the phone into recovery by holding volume down and power keys while the phone turns on. Hold them down till you see a screen with an android and a ! in a triangle. This is bootloader mode. Press home key to bring up the menu. volume up/down keys to move to an option, menu key to select it. You can reboot, install from sd, factory reset or wipe cache. Try wiping the cache then reboot.
And yes, your number and plan are ok because they are on the sim card not the phone.
Hope this helps.