T-1's or Primes possess telepathy as well as telekinesis, they may also possess some other side Talents.  What makes a Prime is the strength and distance they can use their abilities in gestalt or without.

Primes are used to run FT&T Towers because of their 'porting and 'pathing abilities but Primes are rare.

There are Primes who are considered to be unfit for Tower duty, those with high empathic abiliities are sometimes best suited to the medical and healing profession.