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This really depends on the environment.
Dect6 is certainly better range (and sound clairty) than the 2.4 and 5.8 ghz models.
It also depends on the phone model itself, some have larger/better antennas, more powerful transcievers, etc
As a general rule, you can get up to 200m distance with dect6 systems. But this is assuming clear line of sight, no obstructions or interference.
Of course building materials, walls, and other rf and electrical devices can reduce the effective range.