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Cosmic Ray

APN with preferred values can't be selected

I've had an S4,S5,S7 and now an S9. For all other models I had to create a new APN and enter the values manually and select that APN. When the SIM card was activated for the S9, I received a message from my MVNO which I clicked to configure APN settings. When I select APN, there are 3 APNS, 2 which are named "Prepaid ATT MVNO WEB", one of which is selected. Neither have the correct values for Port, MMSC and so forth. The 3rd APN has the values that I normally enter manually but the APN does not have the dot next to it and it can't be selected. But mobile data and MMS seem to work but how?