The author's son missed taking photos while on his trip most of all. Courtesy of Kristina Wright When my son went on a school trip to England last year, he couldn't use his phone most of the time. It was a huge change for both of us — we text most of the day, usually. The silence felt loud to me, but he found he mostly didn't miss texting. When my son told me the details of his nine-day school trip to England last June, one rule stood out above the rest: they wouldn't be able to use their phones for the majority of the trip. He'd be an ocean away, staying in dorms at a school in England, attending a structured conference during the day, and I wouldn't be able to reach him directly whenever I wanted. Instead, communication would come through the chaperones on WhatsApp. They promised updates, photos, and a way to get messages to the kids if needed. This is a kid who texts me to ask what's for dinner and tells me about a good test grade, a bad day, and weekend plans, all before he walks in the door from school.…