the bad news:
Im have sold my iPhone 6.
They do said its works as its should and im will get a full price for it (used of course). That means the wifi on the iPhone 6 does work, so the wifi here is just bad and need purchase a new router (its a lesser issue).
the good news:
Im have dedicated, countinue to use iOS, so im purchased a new iPhone 6s Plus, found to a nice price with a nice reduced price.
That means im will a least fix the touchscreen relative issues, which im believe its the most important one. Even the FrameBuffer might not been fixed, you can still workaround and check when user use switch app. The app does NOT crash here, so you can save your positions and let it quit. Apple should still accept your app doing that. MultiTasking is not important for Games at all. But im do hopefully im can fix this annoying issue, but its not the most important one throught.
Also im will fix those issues later in the feb month, and might even add 3D Touch support by using GameInput API.
So even im might leave iOS/Android, im will leave it with a good shape!