I have the utmost respect for Sculley who, in his 70s, still feels like taking the huge task of launching a mobile phone, when he could comfortably sip a drink on the caribbean seaside as he's earnt the right to live the good life after retirement.
That said, I believe this venture he has no chance because the mobile phone market is already saturated by iOS and Android; marketing teaches us that only a disruptive innovation (like the iPhone was in 2007) can enter a saturated market with a chance of success. Examples of recent attempts include Windows Phone (7, 8 and 10), Blackberry (with their Android devices manufactured by Chinese partner TCL), Amazon (remember the Fire phone? no? exactly), Firefox OS, Ubuntu Touch, and Essential. About this last one: if Andy Rubin - who fathered Android, among other things - failed at it, I can't imagine how Sculley could ever stand a chance.