AT&T 1520.2 - Field Test Mode

crav4speed

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Sep 20, 2012
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I didn't realize this before but there's a new field test mode for the AT&T 1520. It probably came with the Cyan firmware update. But since the AT&T branded Lumia 1520 doesn't have a way to change from 4g to 3g to 2g in cellular settings, it has to be changed using field test mode. Yesterday, I was in an area with crappy LTE so I used field test mode to switch to 3g. But instead of getting the usual 4g/3g/2g drop down menu, I was presented with checkboxes for which bands to enable and disable. There was a checkbox for HSPA 1700 which we all know T-Mo uses but it was unchecked. Unfortunately, I don't have a T-Mo sim to test if it works by checking the box but maybe someone else can if they're willing to risk it. Cool stuff!

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heywhitmarsh

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May 4, 2012
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I didn't realize this before but there's a new field test mode for the AT&T 1520. It probably came with the Cyan firmware update. But since the AT&T branded Lumia 1520 doesn't have a way to change from 4g to 3g to 2g in cellular settings, it has to be changed using field test mode. Yesterday, I was in an area with crappy LTE so I used field test mode to switch to 3g. But instead of getting the usual 4g/3g/2g drop down menu, I was presented with checkboxes for which bands to enable and disable. There was a checkbox for HSPA 1700 which we all know T-Mo uses but it was unchecked. Unfortunately, I don't have a T-Mo sim to test if it works by checking the box but maybe someone else can if they're willing to risk it. Cool stuff!

This has been verified and confirmed to work for a while.

Check out this thread here
http://forums.windowscentral.com/nokia-lumia-1520/326565-how-t-lumia-1520-rm-940-t-mobile-wind-mobilicity-aws1700mhz-hspa-band-4-a.html
 

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