Data connection loss in NYC

Try the steps here:

If you see No Service or Searching on your iPhone or iPad - Apple Support

barbatanas Said:

"Data connection loss in NYC: I am losing data connection everytime I enter or leave Manhattan, in New York City. My phone shows no bars, and I need to turn it off and back on and then I get full bars."

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Whom to Contact:

Contact your Carrier, as they are the one who provide you with the service of Cellular.