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I would start by checking that your new phone is supported by fitbit at www.fitbit.com/devices
Then download the fitbit app onto the phone and login using the same id and password that you used on the iphone. Note, it's important that you use the same account and do not try to create a new account.
If you still have the iphone then remove the Alta from the fitbit app and then make sure there are no connections to the fitbit in the phone's bluetooth settings.
Then, fingers crossed, it should sync to your new phone.
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