finally, we had time to fix GEO DNS issue. So right now with latest app versions > 2.16.4 for Android and > 2.11.1 for iOS you should no longer have problems with it. Also, this fix applied to hardware side as well. You need to have at least 0.4.6 library version for that.
For those of you who did specify Custom IP in the app settings - you may switch back to Blynk.