There are two questions there. (1) Was Martin on the phone with his GF? and (2) Has she given a correct account of what she heard on the call?
The cell carrier can answer the first question definitively and also give us the exact times. As for the second, well, she'd have a powerful incentive to spin a tale, now wouldn't she?
I think she told Trayvon’s dad something...enough for Trayvon’s dad to to check jail before reporting him missing.
Yes to both. ABC has confirmed time and they were discussing him being followed. She heard the conversation and the beginning of the struggle.
“she’d have a powerful incentive to spin a tale, now wouldn’t she”
I imagine you could say the same about Zimmerman’s father, couldn’t you?