No Phone Ceremony

Okay so recently I've been to two weddings where during the ceremony, all the guests have their phones out trying to take pictures. Normally this is fine with me but people were stepping in front of the photographer to get a shot on their phone, and it made me angry, without it being my wedding. I love seeing people's angles of photos and the moments they capture, but I don't want them ruining the shot of me coming down the aisle, or getting in the way of the expensive photographer I'm paying for. Is it wrong of me to ask my guests to keep their phones away during the church ceremony? Or how can I say it nicely to stay out of the photographers way?