Muchas gracias por vuestra ayuda.

El problema era que tenía definida una IP estática.

He dejado una IP dinámica y está solucionado.

SurferTim,
The problem was that I set a static IP that, for some reason, was not suitable.
I put a dinamic IP and it works OK.
Regards

Thanks again.
The problem may be in the cellphone. I will contact the service provider.

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