Transferring Contacts Using iCloud:

As long as you've enabled the iCloud service on your iPhone before, your contacts should be stored on your iCloud account. From there, you can export these contacts in the form of a VCF file, and transfer them on your Android device. For this approach you need access to a computer with Internet

1. Launch your computer's Internet browser and visit https://www.icloud.com/
2. Sign in with your iCloud account and click "Contacts"
3. Choose the contacts that you want to export
4. Once selected, click the settings button located in the lower-left side and select "Export vCard"
5. Your computer will download a VCF file containing the previously selected contacts
6. Import the file to "Google Contacts" or, as an alternative, connect your SG Ace 3 to your PC via USB and copy the file to the "sdcard" directory. Then, launch the "People" application, press "Menu" and tap "Import / Export" > "Import from SD" and select an account as well as the VCF file

Using iTunes to Transfer Contacts:

iTunes offer numerous options for syncing, and allows the user to sync iPhone contacts with a Google account. This is a rather simple but effective approach to contact transfer, and all you need is a computer with iTunes and an Internet connection.

1. Launch iTunes on your computer
2. Establish a connection between your iPhone and computer using the proprietary USB cable
3. When it successfully connects, your iPhone will appear in iTunes. Click it to view the summary page
4. Access the "Info" tab and mark the "Sync Contacts With" check box
5. From the drop-down menu, select "Google Contacts"
6. Register your Google account in iTunes. If you've already added an account, click "Configure" and choose an existing account
7. Click "Apply" and wait for the syncing process to finish
8. Once done, pick up the Ace 3 and register the same Google account as the one used in iTunes. (NOTE: to add an account, go to "Settings" > "Accounts")
9. Allow the account to sync contacts with your Ace 3

Transferring Contacts through "My Contacts Backup":

If you don't have access to a computer you can still transfer contacts from your iPhone, using various third party applications. My Contacts Backup is an iOS app that features the option of exporting your iPhone contacts as a VCF file, and transfer it via email.

1. From the App Store, download "My Contacts Backup" on your iPhone
2. Open the app and tap "Backup" to create a VCF file containing all your iPhone contacts
3. After the file is created, tap "Email" to attach it to a new email
4. Send the email to your own Gmail account
5. On the Galaxy Ace 3, open the email and download the vCard file
6. Launch the "People" app and use the "Import from SD" feature to import the contacts from the VCF file to the Ace 3

Transferring Contacts Using "Send Anywhere":

Last but not least, you can use "Send Anywhere" to transfer your iPhone contacts. This applications can share contacts through a peer-2-peer connection, and as such, access to a computer is not mandatory. For this approach:

1. Download "Send Anywhere" on your Ace 3 from the Play Store
2. Visit the App Store and download the app on your iPhone
3. Launch the application on both smartphones
4. On the sender device (which is the iPhone), tap "Send"
5. Tap "Contacts" and choose the contacts that you want to transfer
6. Tap "Send" when ready, and select a method of transfer. You can, for instance, select "Generate QR Code" and scan the resulting code with the Ace 3's camera to commence the transfer. You can also tap "Receive" on the Samsung device, and enter the code that has been randomly generated on the iPhone