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One of the latest releases from Apple - the iPhone 6s Plus
First things first
The iPhone is simply brilliant. However, we all want to get the best deal possible without being ripped off. So I have composed this guide to give you some helpful reminders to make sure you get a fully-functioning device - one that you crave and, quite frankly, deserve.
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Find My iPhone is an example of one of Apple's security features built into iCloud.
All Apple products have an optional service called iCloud, which includes a tracking service (in case you lose your device). As useful as this is, it ca1n have it's problems too. For example, the person who you are buying the device from may have forgotten to turn off iCloud. Why is this a problem? For security purposes, Apple require you to sign in with the registered Apple ID - the one which was used to setup iCloud. The reason for this is because if somebody stole your device, went home and reset it using iTunes, they cannot activate it after the reset until the Apple ID and password have been typed in. Luckily for you, there are a few ways of preventing this from affecting you.
Request, then check, the IMEI
If you are buying an iPhone and the IMEI number is not supplied, then kindly ask the seller if he/she could dial *#06# on the device's phone keypad and request the IMEI number that is shown on the screen after pressing the green 'call' button. After you have the IMEI number, it is time to check whether the iCloud services are still enabled. There are many websites you can do this from - simply make a Google search for 'IMEI check iPhone', and you'll see many websites which can tell you if the services are enabled on the device. You can also use this IMEI method to check if an iPhone is unlocked (meaning it can be used on any network, with any SIM card).
I will be adding more, as and when I can, to this guide - but in the meantime, this guide should help you get a fully-functioning device.