Datasheet

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How can I determine the distance between my Bluefruit module and my phone in m/ft?

The short answer is: you can't.

RF devices normally measure signal strength using RSSI, which stands for Received Signal Strength Indicator, which

is measured in dBm. The closer the devices are the strong the RSSI value generally is (-90dBm is much weaker than

-60dBm, for example), but there is no reliable relationship between RSSI values in dBm and distance in the real

world. If there is a wall between devices, RSSI will fall. If there is a lot of interference on the same 2.4GHz band,

RSSI will fall. Depending on the device, if you simply change the antenna orientation, RSSI will fall. You can read the

RSSI value between two connected devices with the AT+BLEGETRSSI command, but there are no meaningful and

repeatable conclusions that can be drawn from this value about distance other than perhaps 'farther' or 'closer' in a

very loose sense of the terms.