Yes I do. I also realize that 3G/4G coverage, latency, bandwidth availability and stability varies accordingly each RBS, it's support network and how much of it is in use.
Waves and air are also a lot more susceptible to interference than electrical or optical networks.
If we are talking about minimum standards, requiring minimum of a i5 CPU (broad range, I know), mobile networks shouldn't make it as well, even if they are usable.
It's same as saying L2 runs on Core 2 Duo or a Pentium. It does, just not reliable.
(But who knows, I was just joking. It's not even my topic).
I use my 4G on rare occasions as a backup for my main access. Works fine as well. It's good in some areas.