[Wrestlemania]

A very good choice would be to have text messages send to the cell phone in a way Hattrick does it.
So when a construcion is ready or a reaserch is ready or even more important, when your planet or galaxy is under attack.
You recieve a text message on your cell phone.

That's a start I think.

After there should be a record of witch cell phone number is related to the ruller of the plante. So it would be posible to send orders via text message on your cell phone.