Can anyone summarise the availability of Data Calls on the UK GSM networks?
What tariffs are available that support it?
That’s Circuit-Switched Data (CSD) - not GPRS.
With Vodafone, on pre-pay (“Pay as you talk”), you have to get a separate Data Number assigned to the SIM to allow it to receive CSD calls;
On the other networks, as I understand it, CSD is not available at all on pre-pay - certainly not Data Numbers.
The Networks’ normal “customer service” lines are useless on this - they can’t even understand the concept of a GSM device that isn’t a mobile phone!
I’m not interested in fully packaged services that include servers, gateways, and stuff (like Orange M2M Connect) - just support for dialling & receiving CSD calls.
Does anyone know of a good supplier of data-enabled SIMs in the UK?