How to access Yahoo Mail on your mobile device
If you are using the Yahoo Mail app for the iPhone or Android, you will remain permanently logged in unless you explicitly sign out of your account. Logging in is simple, and the process is identical regardless of whether you are using an iOS or Android device.
Launch the Yahoo Mail client. If you have not yet logged into any email accounts, the Sign In page will be displayed. Select Sign in with Yahoo to log in with Yahoo.
After entering your Yahoo Mail login, email address, or cell phone number associated with the account, tap Next.
Enter your password and then click Next.
After a moment, you will be logged in and redirected to your email inbox.
Follow these steps if you are already logged into one Yahoo account but wish to access another.
Tap the Y! icon in the upper-left corner of the screen within the Yahoo Mail application. 2.
Choose Account Management from the drop-down menu.
Select the option to Add an account. In the case of an iPhone, a dialogue box requesting permission to open a browser window will appear; simply tap Continue.
Complete the form using your Yahoo Mail username, email address, or mobile phone number, then click Next.
Enter your password and then click Next.
yahoo mail login is completed. You now can start sending and receiving emails.