Adding your Yahoo Mail account to your iPhone is a simple and straightforward process.

Source: https://www.devicemag.com/how-to-add-yahoo-mail-to-iphone/

In 2004, Google made headlines by offering a colossal 1GB of storage capacity for Gmail, solidifying its position as a pivotal tool in people’s lives and effectively competing with Yahoo Mail and Microsoft’s Hotmail.

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It is possible to have Yahoo Mail on an iPhone.

Source: https://www.devicemag.com/how-to-add-yahoo-mail-to-iphone/