Nintendo announced back in January
that its first mobile app, Miitomo will be discontinued effective May 9. Since today is the day, Nintendo issued an official statement to thank the millions of fans for using Miitomo since the app's launch.
We want to thank you for enjoying Miitomo so much. Miitomo’s service has come to an end as of Wednesday 9th May 2018, 16:00 (JST). We’ve come a long way since the app was launched, and once again we want to thank everyone who’s been involved. We hope to go on to even bigger and better things in the future with Nintendo, and we hope you’re there to share the fun. We hope to see you again soon!
If you haven't yet saved your Miifotos on your smartphone until now, you will no longer be able to access them. Also, all themed icons and clothing items that you got in Miitomo and used on the Nintendo Account or the Super Mario Run
game will no longer be available after today.
Nintendo also announced that while Mii characters can be transferred to Nintendo Accounts by linking it to Miitomo, their personality and other info will not be saved.