This question is related to this one: Form of Coulomb’s law before the electroweak phase transition.
Given that the electromagnetic and weak forces were united before the electroweak phase transition in the early universe, what, if anything, was the observational difference in the interaction of the elementary leptons like electrons? Stated differently: phenomenologically, what does it mean to say that electromagnetism and the weak force were combined as the electroweak force in the early universe? Since the three $W$ bosons and the $B$ had not obtained mass yet my understanding is that they would have been associated with a long range force. What are the consequences of this?