text: **Subscriber Churn**
  Subscriber churn is a measure of the number of subscribers that 
  deactivated as a percentage of 
  the total subscriber base, usually 
  calculated on a monthly basis. Subscriber churn tells us our success in 
  retaining our subscribers. We calculate it by dividing the number of 
  Wireless subscribers that deactivated (usually in a month) by the 
  aggregate numbers of subscribers at the beginning of the period. When 
  used or reported for a period greater than one month, subscriber churn 
  represents the sum of the number of subscribers deactivating for each 
  period incurred divided by the sum of the aggregate number of 
  subscribers at the beginning of each period incurred. 
  
  **Average Revenue per User**
  Average Revenue per User (ARPU) helps us identify trends and measure 
  our success in attracting and retaining higher value subscribers. We 
  calculate it by dividing revenue (usually monthly) by the average 
  number of subscribers in the period. For Wireless, ARPU is calculated 
  using network revenue. When used in connection with a particular type 
  of 
  subscriber, ARPU is monthly revenue generated from those 
  subscribers, divided by the average number of those subscribers during 
  the month. 