First, WHO PLANS A WEDDING ON A SUNDAY DURING FOOTBALL SEASON!!!! Second, your best bet is to dvr it and watch later. It's a risk of finding out the outcome but it's the only way you can do it with out looking like a douch. The feed on your phone will be terrible with out wifi. You will miss most of the game. Just hang out with your buddy on his day. Enjoy some drinks. Then go home and watch it. I do this all the time. Set your dvr to record over the three hours. I do a hour and a half to be safe. Avoid your phone and any tvs in the area. Turn your radio off on the ride home and start every conversation with "don't tell me about the game I have it recording and will watch later".... Works for me everytime. The key is the phone. Text messages can be a killer.
I can just see it now. The priest says " is there anyone here who thinks these two should not be married speak now or forever hold your peace" at the same time your watching on your phone. Bam Darius sacks Brady. Brady fumbles Williams scoops it up and runs 50 yards for the touchdown. You jump up and scream " YES RUN YOU SLOW SON OF A B*^CH RUN" then start looking for people to high five. That would not go over well....