How can I change the IMEI? [IMEI = 0]

A long time ago I installed a Custom ROM and I lost the IMEI.


I wonder if today it is possible to change it easily.


Also I wonder what advantages have 0 IMEI and advantages of having my real IMEI.


The terminal is a Huawei Ascend G300 with CM9. The phone is free.


Thanks a lot.

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