Any one else getting "Configuration Notification" messages?

magenta5483538

    I keep receiving sms messages from short code number with the following text:
    Configuration Notification. Your MMS Service Settings have arrived. Open the configuration message and save the settings.
    the messages never contain settings  or an attachment which I would not have trusted anyways

    I have received them from the following short codes: 909, 5129, 5126, 5128, 5127. I'm using a one plus 3t and I have verified I am using the correct messaging settings as per https://support.t-mobile.com/docs/DOC-2090

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