Nearly two years and a half after Globe introduced the *143#, it’s Smart’s turn to introduce a go-to-number code (*121#) that will simplify the process of enrolling various prepaid promos, as well as easy access to different account-related information and services.
On your phone’s dialer, just key in *121# and press the call button. This will generate a pop-up window where subscribers can select offers, services and shortcut to account information.

Smart’s new number code is also accessible to postpaid subscribers, albeit not all options are available on the menu.
For more information about this, just head on over to the source link below. Conversely, you can also try the codes out for yourself.
{Source}


Before this one, there’s already *123#. Now, when I tried *121# and *123#, it gave me the same options.