The new model from Nokia company called Lumia 635 is avalable in the AT&T with a special offer.
If You decide to buy this phone, you can choose to sign a deal called GoPhone pre-paid plan.
The phone costs $100 and later on August 8 the phone will become available commitment-free at $140.

Another offer is by signing up for AT&T Next 18 for $5.84 a month or Next 12 for $7 a month. AT&T Next charges a monthly fee but lets you upgrade your phone after 18 months and 12 months.

There is one more option to but the phone.
You can buy the device from Microsoft store which is currently offering the Lumia 635 for T-Mobile but without contract at $130.

Our service sim-unlock.net can remove a sim blockade from all Nokia models.
If You are tired of using the same network all the time, please unlock our phone by using our special codes.
Thanks to this the phone will work in any network you wish.