The short answer
Move to safety first. Use Apple Find My or Google Find Hub through their official address, but treat location, locking and erasure as conditional controls—not a recovery guarantee. Contact the home carrier through a verified route, protect accounts and payment access, preserve identifiers and reports, and never confront someone at a map pin. A travel eSIM cannot find, lock, erase or recover the missing phone. Buy data only if a separate replacement device is compatible, unlocked, under your control and still needs ordinary internet access in the listed destination.
Get to safety and record what actually disappeared
Leave any theft, threat or unsafe place and use local emergency or police channels when the circumstances require them. From a trusted device, privately record the missing model, serial number or IMEI when available, time and last known place, case reference, home carrier, and affected wallet, email or authentication apps. Do not publish a live location, hotel address, passcode, recovery code, eSIM QR code or account screenshot. A phone, payment card, passport and room key each need their own responsible reporting path; one police or carrier report does not automatically contain every risk.
Use the manufacturer’s official lost-device path
Open iCloud.com/find for an Apple device or android.com/find for an Android device by typing or using a saved official address, not a link in an unexpected message. Apple says Find My must have been enabled before loss; Google lists prerequisites including account access, Find Hub and device connectivity. A displayed position may be old or approximate. Marking a device lost or securing it can protect access when the device receives the command, but it does not prove who has it or make personal recovery safe. Ask local authorities what to do with useful location evidence and never travel to confront a person yourself.
Understand the irreversible erasure boundary
Remote erasure is consequential. Apple says erasing cannot be undone and warns not to remove a stolen device from Find My because that removes Activation Lock; theft-and-loss claims can also require the device to remain associated. Google says an erased Android device loses Find Hub location availability and later requires the Google Account password for reuse. Read the current manufacturer and insurer instructions before acting, preserve any claim or police evidence they require, and distinguish erase, account removal and carrier suspension. None is a universal substitute for the others, and an offline phone may not receive a pending command until it reconnects.
Contain the home line, accounts and payment access separately
Contact the home mobile carrier through its independently verified website or a number preserved before the incident. Ask how it handles line suspension, SIM or eSIM replacement, the IMEI and number retention, fees, identity checks and conventional call or SMS requirements. Then review primary email, Apple or Google account, password manager, banking and messaging sessions through each provider’s official security route. Change credentials when the provider advises it and protect recovery methods that did not disappear with the phone. Ignore messages claiming the phone was found that request a passcode, password, one-time code, payment or removal from the manufacturer account.
Treat replacement hardware, number recovery and eSIM transfer as separate
A borrowed, purchased or insurer-supplied phone does not automatically support eSIM, accept another provider, restore the home number or receive an existing travel profile. Verify the exact model and regional variant, carrier-unlock status, account ownership, operating-system setup and access to the provider’s protected delivery method. Do not expose the missing profile’s QR or activation details to a seller, finder or public support thread. Ask the original provider whether the paid profile can be reissued or transferred before buying again; provider acceptance, installation, activation and network registration remain separate events.
Buy ordinary travel data only after the incident is contained
After immediate safety, official device controls, carrier action, account protection and a usable replacement device are settled, list the ordinary internet work still needed: verified booking pages, maps, approved messages or claim uploads. Subtract trusted Wi-Fi, working home roaming and offline copies. Continue only when the replacement device is compatible and unlocked, every required country is listed, activation and validity fit, and the measured allowance is sufficient. Stop if the unresolved need is locating or erasing the old phone, recovering an account or number, receiving carrier calls or SMS, making an emergency call, transferring a profile or guaranteeing reception.