“In a June 20, 2022 briefing to my office, CBP estimated that it forensically examines and then saves data from ‘less than 10,000′ phones per year — which typically include text messages, call logs, contact lists, and in some cases photos and other sensitive data — in a central database. CBP confirmed during this briefing that it stores this deeply personal data taken, without a warrant signed by a judge, from Americans’ phones for 15 years and permits approximately 2,700 DHS personnel to search this data at any time, for any reason.”
https://www.wyden.senate.gov/download/wyden-letter-to-cbp-on-border-searches-of-devices