I sort of assumed Geoffrey was the one who made the call to turn them into fugitives. But I like the idea Alex may have done it. If Alex betrays the group to Jonah that's a little worse than in the comics. In the comics he betrayed his friends to his parents. If he's loyal to Jonah he's selling his parents and his friends down the river.
I really can't see Geoffrey sending the text to Jonah. Geoffrey's ready to go all gangster on him. The text seemed to be about busting Karolina out of the church, although thinking about it, it could have been about the frameup for the murder. I like that better.
I can't see Geoffrey calling the cops on his son, either, considering Geoffrey's past.