Unable to connect to a specific wireless network

I'm currently sitting in a café, connected to their wifi WPA2 with my MacBook.

I can not connect to the same network with my iPhone 4S. It just do not see it--other networks, Yes, but not the coffee. I tried to reset the iPhone; the other networks still appear, but not the one I want to join. I tried to connect manually several times with 'other '.... ', using my MacBook to check SSID and password of the wifi, but the iPhone says that it cannot find the network let alone accede.

It's a signal very strong: the wifi bars are entirely black in the menu bar of my MacBook. My iPhone can see half a dozen other wifi networks, including those where the router is not as tight as one that I am trying to connect. I can not not connect to others: either they are password protected, or require a customer relationship or are not worthy of trust.

What is going on?

Just to add: I know that the standard Apple FAQ on connectivity issues iOS wifi; they are not a help here.

Tags: iPhone

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