I purchased a fitbit charge 3 today. I purchased from Currys my issue is that no where in Currys or on Fit Bit information does it say it is not compatible with some phones. Whilst I can appreciate that maybe I should have checked but being of an older generation (explained in Currys) I had not thought it would be necessary. I cannot return the Fitbit to Currys as I opened the box in order to find out how to use it.I telephoned Fitbit whose answer was we are working on it, it won't work properly with your phone Samsung A3. Just wanted to warn others who may be considering purchase of a Fitbit check phone compatibility. Have told Fitbit they should include such information in their product detail. I have learnt an exspensive lesson today but also I will not spend any money in future with Currys and certainly won't be recommending Fitbit