Hi @Marcelo,
Welcome to our community.
With Vodafone NEXT you can switch phones after 4 months during your contract. Handy when your current device is broken or lost. Or when you simply want the very latest smartphone.
Do you have Sim Only? Then you can switch to a subscription with a telephone after just 2 months. Keep your old mobile or trade it in to pay for your new phone.
If you pay monthly for your old phone, you buy it off in one go until the end date
As a result, the contract is broken and you can renew with a new device and subscription.
You can arrange this via 1201 (Choose the option orders in the menu and then Vodafone NEXT) or via the store.
This is possible from Monday to Friday from 8:00 am to 8:00 pm and Saturday from 9:30 am to 6:00 pm. You can read more about this here: http://voda.fo/ne/smtkt