@Fly2445If you have registered the device with either Apple and find my iphone, Samsungs variant or Google, and you know the app store password you can use these tools to remotely lock and track the device
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company