Alterations
In general, ADAAG requires a text telephone where four or more pay phones are added or altered. This includes replacement of existing pay phones with units of different types, relocating existing pay phones, or installing new pay phones where none had previously been located. (Lowering existing pay phones for wheelchair access or replacing a non-functioning unit with one of the same type are not considered "alterations" that trigger the requirement for text telephones, although phone replacement may offer cost-effective opportunities to provide such access).
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