SMETS1 meters
SMETS stands for 'Smart Meter Equipment Technical Specifications', which is why you don't hear the full name very often – it's not catchy. SMETS1 smart meters were the first generation of smart meters. They send meter readings over the 3G network.
How can I tell if my smart meter is SMETS2?
The easiest way to tell is to look at your electricity meter. If the serial number starts with 19P, this indicates it's a SMETS1 meter. If it starts with 19M, then this means it's SMETS2.
Are all smart meters now SMETS2?
90% of Smart Meter Installations Are Now SMETS2.