Returns phone numbers available for purchase in a country, newest first. Narrow the search with `number_type`, `capabilities`, and `prefix`. Inventory numbers are returned first and support pagination. The final page can include a live snapshot of numbers available from suppliers. ISO 3166-1 alpha-2 country code to search in. Return only numbers of this physical type after applying the country and prefix filters. Possible values (may grow over time): `mobile`, `local`, `national`, `short_code`, `short_code_fteu`, `toll_free` Return only numbers that start with these digits, matched right after the country dial code: with `country_code=US`, `prefix=212` matches +1 212 area-code numbers and `prefix=833` matches 833 toll-free numbers. Digits only. Leave out the country dial code and any national dialing prefix such as a leading 0. Short codes never match a prefix search. Filter by channel capability. Repeat the parameter to require several at once: `capabilities=sms&capabilities=voice` returns only numbers that support both. Maximum number of items to return per page. Cursor from the `next_cursor` field of a previous list response. Returns items immediately after the cursor position in the current sort order. Cursor from the `prev_cursor` field of a previous list response. Returns items immediately before the cursor position in the current sort order. Phone number in E.164 format. ISO 3166-1 alpha-2 country code. Physical type of this phone number. Channel capabilities supported by this number. Cursor for the next page. Pass back as `starting_after` to advance forward. `null` when no next page exists. Cursor for the previous page. Pass back as `ending_before` to step backward. `null` when no previous page exists. Refresh anchor. Pass back as `ending_before` later to fetch items that have appeared since this response. Non-`null` whenever `data` is non-empty; `null` only on an empty page. Distinct from `prev_cursor`.