Vodafone UK has confirmed that they are again having further issues, and network registration and data sessions are affected.
To improve service the GLOBAL SIM core network has been updated to push devices to BT, O2 and Three. This prevents devices from continually attempting to register to Vodafone and authenticate on the APN instead of trying alternative networks. As a result of this change impact on devices using the GLOBAL SIM appears minimal.
Changes to Vodafone GDSP, P2, P6 & Telefonica IOT Profiles are not possible at this time, therefore service may continue to frustrate devices using those SIM profiles in the UK.
If you are experiencing issues connecting to other networks, please attempt a "Purge Network Session" on the DataSIM Portal.