Gmail is a great service when Gmail won't open then you miss the open your important emails and messages in your email account. You will find instant solutions to open your important emails, so try this things: -
Reload the Gmail app
Change your device and re-open your Gmail app
Clear your Gmail app data
Check your internet connection
Check here detailed guide - https://emailscrunch.weebly.com/blog/how-do-i-fix-gmail-on-my-android
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