For up to date instructions, please see Microsoft's guides for either iOS or Android phones/tablets below:
iOS (Apple)
https://support.office.com/en-us/article/set-up-email-using-the-ios-mail-app-7e5b180f-bc8f-45cc-8da1-5cefc1e633d1
Android (Samsung, Huawei, Google, LG, HTC etc.)
https://support.office.com/en-us/article/set-up-email-in-android-email-app-71147974-7aca-491b-978a-ab15e360434c
Webmail (any device)
To access webmail - please visit https://outlook.office.com from any web browser (works on desktop/laptop/tablet/mobile)