What communication rule helped your family when networks were unreliable? / 网络不稳定时，哪条家庭联络约定最有用？

Examples might include a check-in schedule, an out-of-area contact, a meeting point, or switching from calls to texts. Do not post current movement routes. 例如固定报平安时间、外地联系人、会合点，或从通话改为短信。请勿发布当前行动路线。