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I had to do a factory reset and it is working now Thanks

iPhone 6S Plus 

I have tried all this . Still not workingThe thing is that the setting for APN that has posted on web site does not exist on iphonethere is only APN name and user name and passwordnothing for all other parameters like MMSC and .....So whats the corre...

it is selected , I mean it shows on the top right corner automatically  

I see Tmobile only , no At&T