Yes, I believe this to be true. If you purchased the two-way-sync, then you should have all that you need. Install the GB App on your iPhone and use the same user name and password, that you used for his device and the website. In the settings; 2 way sync; set to ON (Download & Upload) on both iPhones.
I don't use multiple devices, but several people do use them. Perhaps one of them will chime in and post on your thread.
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Regards;
Danny 
Last edited by dano; 01-02-2012 at 01:08 PM.
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