The secret codes are the easiest way to have access to hidden options and secret features. Let's open the phone's dialer and enter the developer codes. Afterwards you will able to use the project Menu, Test Mode, Google Play Service, IMEI Mode or Calendar Info.
Which secret codes works in HUAWEI P20 Pro? How to use secret codes in HUAWEI P20 Pro? How to get access to secret codes in HUAWEI P20 Pro? How to open hidden mode in HUAWEI P20 Pro?
More Info:
http://www.hardreset.info/devices/huawei/huawei-p20-pro/hardreset/first-method/
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