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Is there a maximum number of radio you can have?
There is a hard limit, but it's very high indeed; 999 999. So unfortunately you won't be able to get to a million phones.
from http://forums.nextgames.com/walkingdead/discussion/4135/is-there-a-limit-on-the-of-radios-i-can-haz#latest

See Also[]

Radio Tent