¶ 89. An extension into adjacent unserved areas is permitted without prior Commission approval, provided the Commission is notified and the extension is less than 50 square miles. These extensions are on a secondary basis. A licensee must file a major modification application if it would like to incorporate this new area into its CGSA. 47 C.F.R. §§ 22.955 and 22.957. See ITA Reply Comments at 9; see also Western Wireless Reply Comments at 11; see also Nextel Partners Reply Comments at 14 (stating that limits on power levels should not be relaxed in rural areas, due to interference issues). ITA Reply Comments at 9. CTIA Comments at 10. For example, Nextel Partners stated that ``[h]igher power limits result in greater