Hi, Recently, I tested my Iphone project over my Ipad (IOS 4). I done all the steps in Iphone Provisioning Profile. For the first section "Certificates" , I remembered that I request an individual iOS Development Certificates. Then, I had successfully installed my Iphone apps into my Ipad. But the next day, I tested my Iphone project over my another Ipad (with IOS 5 but my Xcode is using IOS 4.3). So, in the Iphone Provisioning Profile there, I not repeat all the steps. What I done at there is I just add New Devices under "Device" section and then modify IOS Development Provisioning Profile by select a new device I just registered and then import this Provisioning Profile into the Organizer-Provisioning Profiles of my device again. But I failed to test my project over this Ipad... There is yellow dot beside my device in Organizer... I don't know why... Am I doing something wrong ? And one more thing is I remember that so far I just requested an individual iOS Development Certificates... But what I noticed is... in Iphone Provisioning Profile, under "Certificate - Distribution", it also contains a certificate. And the expiry date for this distribution certificate is not same with the development certificate... I really confused... Is the distribution certificate created automatically? Now, I feel confused... Can I remove all the things and start over again? That is remove all the certificate, device id, provisioning profile in Iphone Provisioning Profile. I really need some help. Hope someone can reply me. Any comments and suggestion are welcome. Thanks a lot.