These codes are working on most cell phones. Some of them are not usable which depends on service provider

Code	Function
pressing 1 for longer than one second	It will Dial mailbox number note that mailbox number must be specified in the settings.
If you press # for longer than one second	It will activate/deactivate silent profile
If you dial *#06#	Displays the IMEI (International Mobile Equipment Identity) no
If you dial*31#[number][dial]	Dial with own number being displayed-replace [number] with the number to dial
If you dial*#33*[dial]	It will Show the status call locks
If you dial *43#[dial]	It will Turn on tall waiting
If you dial #43#[dial]	It will Turn off call waiting
If you dial *#43#[dial]	It will Show status of call waiting
If you dial *135#[dial]	If will Request own number-often does not work
If you dial **04*[old Pin]*[new Pin]*[new Pin]# code	It will Change Pin – do not enter [ and ]
If you dial **05*[PUK]*[neue Pin]*[neue Pin]# code	It will Unlock Pin (do not enter [ and ])
If you dial **042*[old Pin2]*[new Pin2]*[new Pin2]#  code	It will Change Pin2 (do not enter [ and ])
If you dial **052*[PUK]*[new Pin2]*[new Pin2]# code	It will Unlock Pin2 (do not enter [ and ])
If you dial *#0000# code	It will Displays Software Version – Nokia and Samsung devices

How to Send SMS delayed:

First Enter *Later [seconds]# at the start of the SMS the text and replace [secconds] with a number e.g. enter 10 for 10 seconds, For Example: *Later 30#Hello see you soon”. Don’t forget to insert the space between later and the seconds. This may not work on all service providers.