You need to edit your Original Post because you appear to be using BLE to connect to your phone and not an nRF24L01+. You cannot communicate with a phone with an nRF24.
And, sorry, I am not familiar with BLE.
To make it easier for people to help you please also modify your post and use the code button </> so your code looks like this and is easy to copy to a text editor. See How to use the Forum
...R