Is this sarcasm or...?

The difference between those two numbers is 0.09 GB. 0.09 is 3.8% of 2.35, or 4.0% of 2.26, so whichever way you look at it, it would be correct to say the difference is "within 5%".

He read it as 5% of (like 2 is 5% of 40) instead of within (i.e. accurate).

The difference is even smaller if GB are power-of-2 Gibibytes: 2345MB is 2.29GB.

Verizon could be using one definition of GB and the phone another. (One more reason to use the unambiguous MiB, GiB units.)

GP probably missed the "within".