增加位数to increase the number of digits

• 深圳市电传号码升位启事。

  Notification of an increase in the number of digits of telephone and fax numbers in Shenzhen.

• 升位是我国首次实现全国电话号码统一升位。

  The increase in the number of digits in a telephone number is the first time that such an increase has been carried out across the whole country.

提高职位或地位to promote or enhance one's position