2G is universally the most avialable network, low capacity, great for texting, but has the ability to get to parts other networks can not. Used extensively by companies to monitor and control equipment, remotely reboot systems etc., but the phone companies are trying to shut this network down. Whilst I agree that networks can be an issue I think the better part of the problem lies with Toyota and the poor design of software, management of the server systems and low data storage within the cars DCM systems. How much more frustrating must it be if our cars were all EV and relied on the app for essentials such as selling you where the next charge was coming from.
The MyT app has been pants since I got the car any any short term positive upgrades have always been negated soon after. My car has always been in motion even when stationary.
Such a shame, brilliant car very poor app/software support.