I ve just bought the phantom 4 and on my iPad 2 doesn't appear the camera blue option. So it doesn't show anything on my screen and doesn't connect at all. What should I do?

The app is very demanding and the iPad 2 isn't powerful enough to run it properly.
You wil need to use another phone or tablet to fly.
Here's DJI's list of suitable devices:
Recommended Devices       

    ios: iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 6, iPad Pro, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, and iPad mini 4 Wi-Fi + Cellular. This app is optimized for iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s and iPhone 6s Plus.
    Android: Samsung tabs 705c, Samsung S6, Samsung S5, Samsung NOTE4, Samsung NOTE3, Google Nexus 9, Google Nexus 7 II, Ascend Mate7, Huawei Mate 8, Nubia Z7 mini, SONY Xperia Z3, MI 3, MI PAD

*Support for additional Android devices available as testing and development continues.

Out of that list, one device stands head and shoulders above the throngs.
All around champion, Apple iPad Air2 64gb Cellular. It's best of best... ;-)


RedHotPoker

Hello bernardonogales, please try with the recommended devices in #2 that labroides posts.

RedHotPoker Posted at 2016-6-15 09:09
Out of that list, one device stands head and shoulders above the throngs.
All around champion, Apple ...

It is the best but trying to see the screen in our very sunny country is a massive problem.

Then see this.
www.ghost-armor.com

They make a matte finish film, that all but ends that sun glare reflection catastrophe... Haha
You can also wear a large Sun Hat and or polarized sunglasses...
For awesome sumner hats;
www.leevalley.com

http://www.leevalley.com/en/garden/page.aspx?p=74320&cat=2,


RedHotPoker