You'll have to wait 10 years to see. But on paper it does (we aim for 15) and we have devices in field for some three years. But for the "simple well-designed"

You'll have to wait 10 years to see. But on paper it does (we aim for 15) and we have devices in field for some three years. But for the "simple well-designed" - the problem is, the whole thing is a black box for application developer, and not a bugless one. So much of the "well-designed" part is to figure out when is the right time to pull modem's proverbial power cord. If you don't, it'll gladly eat up your battery in 48 hours after a cell handover goes wrong with no warning.