Buying an unlocked Lumia 640

[furboll929]

Hello Everyone,
It looks like I am going to be upgrading my Lumia 925 to a 640. I was considering the 640XL, but for the amount of time I use the phone, and the price, the phone is not what I need. I actually like my 925, but the one thing I didn?t consider when I got it was that I would not be able to put a SD card in it for more space. Other than that it has just about everything I want. But now I am using a Lumia 520 with a SD card just for my music and podcast which mean that most times I am carrying to phones. On top of that the 520 sometimes doesn?t process the only two apps I use on it fast enough due to the lower memory.
After researching it some and having one of my coworkers constantly tease me about having a 640 I decided to buy one from B&H. The great thing is it will be a dual sim phone and unlocked. However I am a little confused about the RM-versions. On their site I see that there are several RM-1075 RM-1077. For anyone who can answer, what?s the difference between the two? I am on AT&T here in the United States. As a bonus question, are there any known issues with the device that you wish Microsoft would fix? As I said I?ve had no issues with my Lumia 925 other than I wish I could put an SD card in it now

 

[pankaj981]

This is what you should be looking for:

2.5G (EDGE, GSM/GPRS ) MHz:850, 900, 1800, 1900
3.5G (HSPA+, UMTS/WCDMA ) MHz:850, 900, 1700, 1900, 2100
4G (LTE ) Bands:1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28, 38, 40

The RM-1065 supports all US LTE bands on AT&T and T-Mobile along with AWS bands for T-Mobile (in case you want to switch).

 

[furboll929]

Thanks for the information.

 

[Jonah Travisano]

I'm living in Asia at the moment but will be coming back to California...I think the RM 1075 will work on AT&T...I've been looking to buy a new phone here that I can use baggy home...I'm pretty sure from what I've read the RM 1075 will work...this is from the box offend 640 I got...you see its a RM 1075

Red​920