Hello everyone as the subject …..
I noticed that Vodafone and Wind (I only tried them) actually do not allow exercising this option.
All this serves very well into the nat that is local, so applications can not be discussed but when the handheld starts in his regular gprs acquiring ip vnc does not act
here are my steps

1) Installation remora dyndns to create a host of power;
2) Installation of mobile vnc server in order to be able to manage the office and provide vnc assistance to the handheld (in my case a Trimble TSC2)

vnc works where the doors are usually 5900, 5800 and perhaps 5500

making a port scanner on the ip of the handheld connected to GPRS or HSDPA are closed,
I now ask you if this is a solvable problem:), maybe with a different operator from wind and vodafone
Thanks to those who want to enlighten me

More info at VNC Server on mobile gprs or hsdpa impossible
More detail from here VNC Server on mobile gprs or hsdpa impossible