When setting up a new iPhone, follow these steps.
1. Transfer or synchronize your contacts from your old Nokia phone to the Exchange server
2. Setup your new phone
Set VoiceMail number in iPhone under VoiceMail button
1. Go to dialing mode
2. Click on the Keypad tab
3. Type **5005*86*voicemail-number# (e.g. +358420123456). You can type the plus sign character by holding your finger on the zero button for a while.
4. Tap Call
Remoing the VoiceMail number
1. Go to dialing mode
2. Click on the Keypad tab
3. Type ##5005*86#
4. Tap Call
Calling the VoiceMail number
1. Go to dialing mode
2. Tap the VoiceMail button
For more instructions on synchronizing:
Download a manual from http://support.apple.com/manuals/iphone
Backup your phone to iCloud
Apple instructions on iCloud backups at http://support.apple.com/kb/PH12519?viewlocale=en_US
Apple iPhone 4