To be able to download and login to MetaTrader on your "iOS" phone, you need to:

You can download it directly from the Apple store by clicking here. 

Search for MetaTrader4.

Click on the Cloud icon and MetaTrader will begin to download.
(Once downloaded, you will need to open the application)

Then, click on the Settings tab to access the New Account option.

Click on Login to an existing account.

KOT- Live2 or KOT-Live3: mt4.kot4x.com 

KOT- Demo: demo.kot4x.com
 

Finally, enter your MetaTrader Account Number and Trader Password.