Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: The term country code frequently refers to international dialing codes, the E. 164 country calling codes.

The word country code refers to international dialing codes. the E. 164 country calling codes. The E. 164 is a numbering plan for country calling codes.