# 21 Recommendation on finding the locally used channels

End-devices that can be activated in territories that are using different frequencies for LoRaWAN will have to identify what frequencies are supported for join message at their current location before they send any message. The following methods are proposed:

A GPS enabled end-device can use its GPS location to identify which frequency band to use.
End-device can search for a class B beacon and use its frequency to identify its region
End-device can search for a class B beacon and if this one is sending the antenna GPS coordinate, it can use this to identify its region
End-device can search for a beacon and if this one is sending a list of join frequencies, it can use this to send its join message

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