Gmail / Calendar  - syncing to Android and iOS devices (3.x/4.x/5.x)

How To:  Show/Add "shared google calendar" on iOS/iPhone.
2 Steps.
1. Add gmail account as an exchange account (don't click gmail account)
2. Open webbrowser from phone and go to:  m.google.com/sync

1. (add gmail account as an exchange account)

- Settings - Mail, Contacts, Calendars

 - Add Acount (Microsoft Exchange, not Gmail!!)

Enter you name/settings

Email:  name@gmail.com 

Domain (leave empty)

Usernamn = full gmail account with included domain (asdf@gmail.com)

Password = you password

Press next.

Server = m.google.com

done!

2.
Start webbrowser (Safari), go to URL: m.google.com/sync  

log in with your username/password, 

Select device that you want to sync (if you have several iDevices, they are being shown here, iPad, iPhone etc)

Select the shared calendar you want to sync.

above webpage requires english language in webbrowser. Click change language from page, switch to english and you should be redirected back.  
The sync page shows up from several mobile devices.