The GPRS signal is only for statistical usage monitoring, it doesn't affect the operation of a home charge point.
If you had a signal on installation, and since then, it's vanished through no fault of your own, (maybe a cell tower is down?) I wouldn't worry.

If you worry that the Scottish Government (or OLEV) aren't getting their statistical feed, then speak to the installer.

Some installers use roaming SIMs, but I think the Pod Point only use EE, though they can use others if EE have no signal locally.

 

What happens if you want an OLEV funded charger in the middle of Wales where there is no phone signal on any network?

 

Your installer will take a signal level when they do the site survey (warn them that you have no signal)

The installer then has to apply to DVLA (yes, DVLA, not OLEV) for an exemption. Once that's all cleared up, they will go ahead and do the install, and claim the grant from OLEV.

We live on the edge of Dartmoor, no signal, we received the grant - although there was a bit of delay in getting the approvals!

 

Hm, starting to think we won't get this done before March 1st then!

 

Have a look at the guide for customers here

https://www.gov.uk/government/uploa.../file/418525/electric-vehicle-homecharge-scheme-guidance-for-customers-2015.pdf

They should approve your application, based on no GPRS coverage, in 10 days.