Mark your calendars, T-Mobile fans, because the magenta carrier just sent us a teaser for its next big Un-carrier move.

T-Mobile just sent out invitations to an event in Los Angeles on June 18. The teaser image includes the number “5.0”, a reference to this being T-Mobile’s fifth Un-carrier phase, as well as the tagline “We don’t play it safe and sound.”

Exactly what T-Mobile CEO John Legere and Co. have planned for the June 18 is a mystery, but T-Mo’s Un-carrier initiative has brought some big moves in the past, so you’ll definitely want to keep it locked to PhoneDog for more details on T-Mobile’s plans as we get ‘em.

What do you hope T-Mobile does with its next Un-carrier move?