Chinese script appearing on my phone

[BandOfBrothers]

Can you screenshot it and upload an example here. 

Put the phone in Safe Mode which will turn off all the downloaded apps and leaves the stock ones alone which can then help you determine if its a rogue app causing this. 

[BuffaloPhil]

Same problem on my Galaxy s10+. 

When I activate airplane mode.

 

[Je655]

I would recommend "nice catch" by Samsung. This app allows recording the history of features on your phone. One of these is toast history and this will tell you if a system app or another app is causing the toast message your experiencing.

http://apps.samsung.com/appquery/appDetail.as?appId=com.samsung.android.app.goodcatch

Hope this helps.

[lsb]

Im also seeing this in my s10+. How do we remove it?