← Area code 720
720-428 phone numbers
Numbers 720-428-0000 to 720-428-9999 are assigned to Onvoy, LLC in Denver, CO. 9 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.
Reported numbers in 720-428
- 1 (720) 428-2082 2complaints
- 2 (720) 428-2742 2complaints
- 3 (720) 428-2021 1complaints
- 4 (720) 428-2152 1complaints
- 5 (720) 428-2377 1complaints
- 6 (720) 428-2554 1complaints
- 7 (720) 428-2652 1complaints
- 8 (720) 428-2683 1complaints
- 9 (720) 428-2739 1complaints
- 10 (720) 428-2992 1complaints
- 11 (720) 428-4184 1complaints
- 12 (720) 428-4337 1complaints
- 13 (720) 428-4466 1complaints
- 14 (720) 428-4804 1complaints
- 15 (720) 428-4859 1complaints
- 16 (720) 428-4935 1complaints
- 17 (720) 428-5860 1complaints
- 18 (720) 428-6178 1complaints
- 19 (720) 428-6424 1complaints
- 20 (720) 428-7482 1complaints
- 21 (720) 428-7572 1complaints
- 22 (720) 428-8346 1complaints