As of today, cell phones are now allowed during taxi upon domestic arrivals.  Check out today's Newsreal:

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     New Cell Phone Policy Takes Effect Today                 
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United is implementing a new cell phone policy for            
all U.S. domestic arrivals, effective today.  Recent          
testing by Engineering on United aircraft indicated           
that it is safe to use cell phones while the plane            
is taxiing to the gate.  This policy applies to all           
United planes and does not include United Express at          
this time.                                                    
                                                              
"United has conducted extensive testing before                
implementing this policy change," says Brian Haynes,          
manager-Flight Operations Technical.  "We did our             
homework, examining cell-phone interaction with               
communications and navigation systems on each of our          
fleet types.  We also ensured this process was as             
simple and as safe as possible for our passengers.            
Now that we've determined that this change is safe,           
we're ready to bring it on board."                            
                                                              
According to the revised policy, cell phones may be           
used on board aircraft at U.S. airports at the                
following times:                                              
                                                              
* After the plane has landed and exited the active            
runway.  Flight attendants will notify customers              
when it is safe to use cell phones during taxi to             
the gate.                                                     
                                                              
* While the plane is parked at the gate with the              
entry door open, consistent with United's previous            
policy.                                                       
                                                              
* During extended ground holds at the captain's               
discretion, consistent with United's previous                 
policy.                                                       
                                                              
There will be no changes to the policy on                     
international flights or to the current departure             
policy for U.S. domestic or international flights.

See also: Cell Phone Use During Taxi to Soon Be Permitted