Featurephone IMEI editor codes
------------------------------
These secret codes have been tested on most non-Nokia featurephones
manufactured since 2016. They open either the IMEI editor directly, or the 
engineering menu where it can be found (like "Para Set" - "Update IMEI 
Number" on Mocor-based phones). In some cases, you may be required to press 
the Call button after entering the code, so please test both options.

#*8378#1#
*#0160#
*#0161#
*#5353#
*#0066#
*#1923#
#*868*#
*#4224876#
*#1263#
*#66#
*#066#
*#0011#
*#1122#
*#0623#
*#0622#
*#09#
*#4634#
*#4634*#
*#868*#
*#020*#
*#1207#
*#1208#
*#2012#
*#2013#
*#9999#
*#*#3646633#*#*
*#93646633#
*#64276#
*#36*#
*#2018*#
*#44#
*#0606*#
*#*#067067#
*#9981#
*#1169*#
#*8378#9#
*#*#1122#*#*
*#123456#
*#1234567#
*#2018+80003#
*#91*#
*#02#

This list will be updated from time to time but it already covers over 80% of
cheap featurephones on the market.

Bonus:

For MediaTek-based featurephones (MT6260, MT6261, MT6276 chipsets) without
secure boot, if you find a way to open a USB-COM connection, you can also 
use the following AT commands to update IMEIs (the change will take effect 
after rebooting the phone):
For SIM1: AT+EGMR=1,7,"newimei"
For SIM2, if present: AT+EGMR=1,10,"newimei"
For SIM3, if present: AT+EGMR=1,11,"newimei"
For SIM4, if present: AT+EGMR=1,12,"newimei"

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