Newbie to Plusnet mobile, but hope this helps.
Your phone needs various settings (eg carrier, network, etc) to allow it to firstly connect to the mobile network correctly, your provider correctly, and thereafter to provide the services that are part of the contract (eg voice, data, picture messaging, etc.).
Although infrequent they do occasionally need updating - messages always have been from “your provider” that I recall over all the years I’ve had them. I had one in the last two weeks to update the network settings for my Plusnet contract.
Without updating you may loose functionality/services at some point. If you have already lost any function (I had voice and texts, but no data for example for a day or so), you will need to update to have the full service you are contracted for.
BTW you can check the settings in the phone’s setting’s menu (precisely where will be make/model dependant). However, most are meaningless to the general user to view except the carrier should be obvious and will be listed as EE with Plusnet mobile. Checking them on the phone, however, usually triggers an update settings request (can maybe take up to a couple of minutes so leave it open if not immediately displayed) if you want to do an update now rather than wait.
