https://devzone.nordicsemi.com/f/nordic-q-a/46781/issues-with-bluetooth-connectivity-and-application-speed-for-some-phonesWe developed device based on nrf52840 and android app based on nrf uart v2.0. The application runs very slow in google pixel 2xl., oneplus3 etc thich are updated to latest android OS.Connecting the bluetooth itself takes 20 to 30 seconds. What could been-USTelligent Community 13Tue, 30 Apr 2019 10:04:01 GMThttps://devzone.nordicsemi.com/thread/184518?ContentTypeID=1Tue, 30 Apr 2019 10:04:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03975744-96a1-4cfa-86ff-98d2c7c23452Vishnu Pradeep<p>We&#39;ve tested with a bunch of phones and only the google pixel 2xl is having the issue. Even the nrf uart v2 application is having the issue</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/184483?ContentTypeID=1Tue, 30 Apr 2019 08:51:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b6559db-932a-4c40-bf4f-a2f5d9e24cebawneil<p>You need to debug and instrument both ends - Android and nRF - to see where the problem(s)/bottleneck(s) is/are:</p> <p><a href="https://www.argenox.com/library/bluetooth-low-energy/ultimate-guide-to-debugging-bluetooth-smart-ble-products/">https://www.argenox.com/library/bluetooth-low-energy/ultimate-guide-to-debugging-bluetooth-smart-ble-products/</a></p> [quote userid="15318" url="~/f/nordic-q-a/46781/issues-with-bluetooth-connectivity-and-application-speed-for-some-phones"]Some phone running the same android version(Mi A1) is working smoothly[/quote] <p>Instrument those, too, and see where the difference(s) occur(s).</p> <p><strong><a href="https://www.avrfreaks.net/comment/2418156#comment-2418156" rel="noopener noreferrer" target="_blank">How To Debug</a></strong>.</p><div style="clear:both;"></div>