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Apple has delayed the implementation of new privacy measures designed to stop apps and websites tracking people online without their consent.

The changes also mean app will have to ask a user's permission to access the ad-tracking ID on an iPhone or iPad.

The measures were due to arrive in the latest iOS 14 update in the autumn.

But Apple said the changes were being delayed until the start of 2021 to give app developers and websites more time to adapt their services.

Facebook has warned that Apple's privacy plan could make one of its advertising tools "so ineffective on iOS 14 that it may not make sense to offer it on iOS 14".

The social network says it will no longer collect users' ad-tracking IDs on iOS 14, and that Apple's plan had forced it to make that decision.

Apple devices including the iPhone, iPad and Apple TV box have a unique ID known as the "identifier for advertisers" (IDAF).

It can help apps monitor the effectiveness of an advertising campaign. For example, it can help determine whether somebody downloaded an app after seeing an ad.

Android has a similar tool known as the Android Advertising ID (AAID).

Apple already lets people switch off access to their IDAF on iOS.

However, once the change is implemented in 2021, it will be off by default and advertisers will have to ask permission to access it.

Apps will also have to ask permission to track what people do in apps and on websites owned by other companies.

Additionally, when iOS 14 is released in the autumn, apps will have to in Apple's App Store.

Another new security feature will highlight when an app accesses information on the user's clipboard.

One of the biggest changes to the iPhone's iOS 14 operating system will be a shake-up of the home screen.

Apple is updating its "widgets" - blocks that display a stripped-down, small app window - so that they can be placed among the icons for other programs.

It is also releasing a new app, called Translate, which carries out language translations offline, offering an alternative to Google Translate.

It will support 11 languages to begin with, including English, Mandarin, French, German, and Arabic.

For the first time, users will be able to set third-party email and web-browser apps as the default in iOS, rather than Apple's own software.