Hi, after sending 'WEB' to 40127, I get the following reply:
It looks like you’ve swapped your SIM or updated your device. To continue using data and sending picture messages, you need to update your settings manually, as your device doesn’t support automatic settings updates. Get started at vodafone.co.uk/settingsinfo
There are no instructions for updating a Lumia 950 settings manually. There are instructions for other Microsoft phones, but the settings aren't the same as for a Lumia 950.
Does someone know what the settings should be?