My app uses a UDP network protocol involving very little data.  But the 
round-trip latency is important.  I have heard that 3G latency is more 
variable than wi-fi, especially after a long period of inactivity.  My app 
will use the network data after several hours of inactivity, and I want 
that very first access to have the shortest possible latency.  (It is 
querying a network time server).  I thought about sending out some nonsense 
UDP packets to some other host just to "wake up the channel", since I am 
told that the 3G network switches to faster response only after a few 
hits.  But then I thought it might be simpler just to insist that wi-fi be 
available to provide this particular function.  So is there anything in the 
API that allows me to either query if wi-fi is available, or to force the 
network access to use only wi-fi?


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