Possibly a small but important point. JT’s new mast was not built under the ESN programme, it is part of the Scottish Government’s 4G Infill programme.If the mast is 4g only then yes it makes sense, all depends on the mast setup. As its really only been put in place for emergency services then 4G only is a possibility.
based on that site 3G is probably not on the mast.
S4GI is designed to bring 4G connectivity to not-spots. They are open access sites available to all the main MNOs and also to local WISPs.
EE is the anchor commercial network on most of them. It is expected that EE will use 4G from those masts to fulfill BT’s Universal Service Obligation for broadband in those areas, and to do that they will need to use B3 1800Mhz.
The ESN will be on most, if not all, of the S4GI masts also.