> Phones have gigabytes today.

Phones have zero HBM today.

> There are famous laws of growth that put terabytes at just a few years away

I assume you're referring to Moore's law here, but if you are, it doesn't really apply to HBM in the same way, especially in a smartphone form factor where LPDDR is the only practical option due to heat and energy constraints, and a variety of architectural complexities specific to HBM that make a TB of it in a smart phone something far beyond what we can hope for in any timeline we can project today.