4 Amazing Phone Functions You Had No Idea Existed / most useful Android secret code

4 Amazing Phone Functions You Had No Idea Existed / most useful Android secret code.

1-IMEI CKECK CODE NUMBER: *#06#

2-waiting for all calls activate: *43#
waiting for all calls deactivate:#43#

3- hide your number in outgoing calls: #31#

4- Forwarding calls other numbers activate: **21# mobile number #
Forwarding calls others number deactivate: ##21#