Telephony base swells; ARPU continues to dip New Delhi April 17 Telephone subscriber base of the wire-line and wireless services together reached 189.92 million in the quarter ending December 2006 from 170.02 million on September 30, 2006, showing an increase of 11.7 per cent during the quarter. However, the blended ARPU (Average Revenue Per User) per month for GSM services has declined by 6.