Los Angeles-based J2 Global, the provider of cloud-based services in the phone, email, email marketing, online backup, and other areas--and which also owns Ziff Davis--is further expanding its empire today. The company said it has acquired City Numbers, a Birmingham, UK-based provider of toll free phone numbers. Financial terms of the buy were not disclosed. J2 Global said that City Numbers provides inbound local, national and international toll free phone numbers in over 80 countries. The company said it will use the buy to expand its inventory of toll free numbers used in its various services.