It's hit or miss any way. I have Verizon and reformatted my entire PS4, only connected to my mobile hotspot, and it still gave me the error. Others have said as much here as well.
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Edited by Misaki Satsuki: 9/22/2016 1:39:23 PMI tried with my AT&T Galaxy Note 5 and it did not work either. It's funny we can't have AT&T Internet but we can have an AT&T mobile phone provider.