The YPPN additional numbers app is an international service that allows you to add extra mobile and landline numbers onto your mobile. The app allows you to manage calls and SMS to and from the new number (or numbers) residing on your smartphone within the YPPN app. Additional numbers are available should you require multiple numbers. So no need to buy a second mobile device to get a second number, just add the YPPN app to your existing smartphone.
Please be aware that any purchases made through the app may be subject to your local VAT or tax charges.