What iPhones are impacted by 3g shutdown? - Apple …
A: The iPhone SE will no longer be able to connect to 3G service, as such any area not completely covered with AT&T's 4G/LTE Network may be a dark spot for you. It should continue to work normally on 4G/LTE for now, but given it is 6 year old tech now, it may be wise to consider an upgrade to a slightly newer device sooner, rather than later.