Ready Check / iPhone
Get an iPhone ready to be found
5 settings. Menu names differ between versions; the maker’s page beside each one is the source.
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1
Turn on Find My iPhone, the Find My network and Send Last Location
Settings›[your name]›Find My›Find My iPhoneWithout it nobody, not even Apple, can show you where the phone is or lock it remotely.
Source: Apple: How to turn on Find My on your iPhone, iPad, or Mac
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2
Use a passcode with Face ID or Touch ID
Settings›Face ID & Passcode (or Touch ID & Passcode)Lost Mode locks the phone with this passcode; with no passcode there is nothing to lock it with.
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3
Turn on Stolen Device Protection
Settings›Face ID & Passcode›Stolen Device ProtectionAdds a Face ID or Touch ID check for sensitive changes when the phone is away from familiar places.
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4
Turn on iCloud Backup
Settings›[your name]›iCloud›iCloud BackupIf the phone never comes back, the photos and messages still do.
Source: Apple: How to back up your iPhone or iPad with iCloud
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5
Write down the serial number and IMEI
Settings›General›AboutPolice and the carrier ask for them; you cannot read them off a phone you no longer have.
Source: Apple: Find the serial number or IMEI on your iPhone, iPad, or iPod touch
Keep the numbers where you can reach them
Put this iPhone in a private plan: its serial, IMEI and carrier number, ticked settings, and its own “it’s missing” page. Two devices free. Lost Hour Pass is $1.95 a month or $19.50 a year for 12 devices; Household is $3.95 a month or $39.50 a year for 30. Free during preview: nothing is charged.