The difference is that Teslas are much much larger than a phone which gives ample room for advanced cooling systems which prevent the heat buildup that kills lithium ion batteries.

The only way to get a similar number of cycles with a phone battery would be to put a large heat sink and possibly a fan on the phone’s SoC and battery or to permanently throttle the SoC so that it never gets hot, even when all cores are maxed out. Essentially, the choice would be a brick-like phone or a phone that runs like it‘s a decade old. Neither seems like the sort of compromise consumers outside of a small niche would buy.

Of course in the future we may see battery chemistries that aren’t so sensitive to heat, but no such battery is on the market currently.