I know that the Lumia 650 is going to be announced on Feb 1, 2015 but the 640 is still a solid device. And now it is available at a great price from Best Buy. There are plenty of forums that will walk you through how to get it unlocked for free from AT&T, see links posted below. Enjoy it on any GSM network including internet tethering, see link below. I use mine on T-Mobile without any issues.
AT&T GoPhone Microsoft Lumia 640 4G LTE with 8GB Memory No-Contract Cell Phone Black NOKIA LUMIA 640 - Best Buy
There is a step by step tutorial to get it unlocked here and over at Reddit:
http://forums.windowscentral.com/microsoft-windows-tech-deals/396029-2.htm#post3359736
https://www.reddit.com/r/windowspho..._to_unlock_your_att_lumia_640_gophone_united/
Look at the third post in this thread to get Internet Hotspot working without any issues.
http://forums.windowscentral.com/nokia-lumia-830/351620-internet-sharing-lumia-830-a.html
AT&T GoPhone Microsoft Lumia 640 4G LTE with 8GB Memory No-Contract Cell Phone Black NOKIA LUMIA 640 - Best Buy
There is a step by step tutorial to get it unlocked here and over at Reddit:
http://forums.windowscentral.com/microsoft-windows-tech-deals/396029-2.htm#post3359736
https://www.reddit.com/r/windowspho..._to_unlock_your_att_lumia_640_gophone_united/
Look at the third post in this thread to get Internet Hotspot working without any issues.
http://forums.windowscentral.com/nokia-lumia-830/351620-internet-sharing-lumia-830-a.html
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