Antenna's being internal are quite hard to screw up. They tend to be a slither of metal down the inside, and either are attached to the mainboard still, or aren't... they work, or they don't.
So I think it's unlikely.
Although... if you'd said you'd sat on the phone and it cracked... i.e. potentially bent the mainboard. Then it becomes plausible.
But a drop is going to do far more damage to the outside than the inside.
Antenna's being internal are quite hard to screw up. They tend to be a slither of metal down the inside, and either are attached to the mainboard still, or aren't... they work, or they don't.
So I think it's unlikely.
Although... if you'd said you'd sat on the phone and it cracked... i.e. potentially bent the mainboard. Then it becomes plausible.
But a drop is going to do far more damage to the outside than the inside.