Anyone know of secret menu's or codes?

[ZMAX4EVER]

Sometimes phones have secret menu's or options that you can access via entering specific codes into the phone dialer. Sometimes you can access calibration tools such as screen touch sensitivity, etc. Anyone know of any codes for this phone? Any general ZTE codes?

 

[Elix9000]

Sometimes phones have secret menu's or options that you can access via entering specific codes into the phone dialer. Sometimes you can access calibration tools such as screen touch sensitivity, etc. Anyone know of any codes for this phone? Any general ZTE codes?

Some codes from the ZMAX 1 and 2 work i tested a couple. Don't play around too much though as I'm not sure if the factory reset ones work or not