On Friday, August 12, 2011 11:44:47 AM UTC-4, chu wrote:

As i know,if a client is running on PC,if located in a LAN,the server 
> in the Internet cannot create a TCP connection to it 
> initiatively,because the router of the client will discard the 
> connection request.if we want to connect a client in LAN from a server 
> in the Internet, we must use some technologies as P2P,or the client 
> make a TCP connection initiatively. 
>

Yes, you will tend to have the same problem with devices on mobile networks.

Devices on wifi networks should be as reachable (which is to say, most 
likely not) as PC's on those same networks.

For android you might look into Cloud-to-device-messaging C2DM as a way of 
contacting the device.

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