I bought a used Coolpad, but like new. Whenever I try to download an app, be it an old one already installed on old phone or a new, never before loaded one, it keeps wanting to send data to old phone, an LG Admire. In the box, looking for device compatibility, only the old phones model number comes up.
I'd do a factory reset, then log on as yourself and try again. There should then be no trace of any other accounts on that device and you should be able to start afresh.