[AC Question]

I need to use the * key to open electric gate remotely
This works on ordinary mobile but I have just upgraded to smartphone and cannot see a way to do this.

[SpookDroid]

It really depends on your phone model, but usually when on a call you should be able to see a Keyboard or Keypad icon somewhere on the call screen. That lets you bring up the numeric pad, just as it would for any other phone.