Hi. See the below options:
- You PPP is not tied to your IMEI but to the firmware. Refer here to fetch it back if you forgot it. http://satechhelp.co.za/6970/Forgot-Privacy-Protection-Password
- If that does not help, then consider a software reload http://www.satechhelp.co.za/10361/Download-Flash-Rom-Firmware-Mobicel-Retro