4 Zoho Mail Accounts - on one screen and setting up on iPhones

4 Zoho Mail Accounts - on one screen and setting up on iPhones

Hello,
 
We really need support here to stick with Zoho - even if of course that means upgrading our account.
 
We have 4 email addresses set-up @domain-name no @zoho.com
 
 
We need to be able to do the following:
 
1.  Display all four email accounts on a single screen interface - allowing us to read and respond to emails keeping the send-from address i.e. info@ viewed on a single interface and then if we repsond to that email it comes from info@
 
2.  Set-up the same access to all four accounts on two iPhones - allowing us to view and respond in the same way.  Our previous system (gmail) allowed us to do this but we cannot work out how to do it in Zoho.
 
We really need to sort this out asap. 
 
Zoho - please support us in this.
 
Thank you