What can be done to the serial data to the mobile phone via bluetooth

[he]

I want to send data to the serial port, and then sent to the mobile phone via bluetooth, and need to adjust the frequency of the bluetooth, how to do?

[Asbjørn]

Sending serial data can be accomplished by using the simple_uart code example in the nRF51 SDK and using the "nRF UART" app on iOS/Android.

I'm not sure what you have in mind with regard to adjust the frequency of the bluetooth. The Bluetooth stack will handle the frequency hopping scheme. If you want to adjust the number of Bluetooth connection events, you can do this by sending a updated connection parameter request from the nRF51 to the central/phone.