You can get the Galaxy Z Flip6 for free on AT&T by trading in an old Galaxy S, Z or Note series device
Briefly

When buying a Galaxy Z Fold6 or a Z Flip6 with AT&T, you can add a Galaxy Watch7 or Galaxy Tab A9+ 5G for $1 a month each for 36 months.
AT&T offers up to $1,100 off the Galaxy Z Fold6 and free Galaxy Z Flip6 by trading in old Galaxy S, Note, or Z series devices.
AT&T introduces Next Up Anytime service for $10 a month, allowing phone upgrades up to three times a year when at least 33% of the current phone is paid off.
Read at GSMArena.com
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