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Some people seem to have no problems using a P9 Lite but many do. Fitbit say:
"Due to Bluetooth issues that prevent certain devices, like Fitbit devices, from syncing, our products aren't compatible with the following phones:
taken from: https://help.fitbit.com/articles/en_US/Help_article/2315/?q=p8
It would be a big gamble to get a versa if you don't have access to a backup device (computer or phone). The list of supported devices is at www.fitbit.com/devices
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