https://devzone.nordicsemi.com/f/nordic-q-a/1303/is-it-possible-to-connect-multiple-ble-devices-with-the-nexus-4-android-applicationHi, We have nrf51822 evaluation kit and some custom board with nrf51822 chipset(works fine). And also we have tested the nrftoolbox application with the proximity service. Since the Nexus 4 does not support unbonding properly we modified the device codeen-USTelligent Community 13Thu, 09 Jan 2014 17:15:49 GMThttps://devzone.nordicsemi.com/thread/5987?ContentTypeID=1Thu, 09 Jan 2014 17:15:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6d9f2cad-4f66-47d8-8838-8c8dc2792eb0Hung Bui<p>Hi Balaji,</p> <p>Recently the Nexus 4 gets updated to Android 4.4.2 and it works much better now regarding the bonding and unbonding issue. You may want to check if your device has the latest Android version.</p> <p>If you configure your proximity profile without encryption requirement, it&#39;s would not match with the proximity profile that <a href="https://developer.bluetooth.org/TechnologyOverview/Pages/Profiles.aspx">defined by Bluetooth SIG.</a> And you may have interoperability issue with other vendors apps/devices.</p> <p>Regarding multiple slave with one android application , please refer to <a href="http://devzone.nordicsemi.com/index.php/multiple-slave-support-for-nrf-toolbox-proximity-application">this thread</a>.</p><div style="clear:both;"></div>