Terminated due to memory issue at start - in Xcode 7 running iOS

When I run my Game on the iPad it works fine; when I run it on iPhone it's black screen (no Unity Logo) then Crash and this log :

I have absolute no clue what the cause is; can somebody help me at least get started for debugging ?

Thanks !

 2015-11-23 20:32:01.646 Pichu[227:4600] -> registered mono modules 0x1018ec4f0
 -> applicationDidFinishLaunching()
 PlayerConnection initialized from /var/mobile/Containers/Bundle/Application/BBCD3955-F40C-4747-8CED-8802CB586FBA/Pichu.app/Data (debug = 0)
 PlayerConnection initialized network socket : 0.0.0.0 55000
 Multi-casting "[IP] 192.168.42.106 [Port] 55000 [Flags] 3 [Guid] 3965330717 [EditorId] 4025572445 [Version] 1048832 [Id] iPhonePlayer(iPhone-de-Cem):56000 [Debug] 1" to [225.0.0.222:54997]...
 Waiting for connection from host on [192.168.42.106:55000]...
 Timed out. Continuing without host connection.
 -> applicationDidBecomeActive()
 Requesting Native Resolution
 Init: screen size 1334x750
 Initializing Metal device caps
 Initialize engine version: 5.2.3f1 (f3d16a1fa2dd)
 WARNING: Shader Unsupported: 'Pixelatto/PixelPerfect' - Pass 'FORWARD' has no vertex shader
 WARNING: Shader Unsupported: 'Pixelatto/PixelPerfect' - All passes removed
 Setting up 1 worker threads for Enlighten.
   Thread -> id: 16e78f000 -> priority: 1 
 Message from debugger: Terminated due to memory issue