If you want a sovereign multisig yet easy to set and coordinate right on your iPhone look into nostr:nprofile1qqsd86wm25agd35yl34sly6wacdk44p5u74dpxmrv42mnekj6yp08pqpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqg6waehxw309ac8junpd45kgtnxd9shg6npvchxxmmd9u6x9xyn