Prefixes with phone numbers reported to the Federal Trade Commission and Federal Communications Commission
| Prefix | Phone Numbers | Last Complaint |
|---|---|---|
| 231-331 | 58 | February 7, 2019 |
| 231-243 | 13 | February 7, 2019 |
| 231-665 | 4 | February 7, 2019 |
| 231-244 | 211 | February 7, 2019 |
| 231-310 | 28 | February 7, 2019 |
| 231-590 | 50 | February 7, 2019 |
| 231-666 | 18 | February 7, 2019 |
| 231-709 | 20 | February 7, 2019 |
| 231-429 | 38 | February 7, 2019 |
| 231-769 | 13 | February 7, 2019 |
| 231-845 | 7 | February 7, 2019 |
| 231-440 | 15 | February 7, 2019 |
| 231-246 | 30 | February 7, 2019 |
| 231-876 | 6 | February 7, 2019 |
| 231-335 | 16 | February 7, 2019 |
| 231-408 | 41 | February 7, 2019 |
| 231-507 | 3 | February 7, 2019 |
| 231-557 | 71 | February 7, 2019 |
| 231-375 | 14 | February 7, 2019 |
| 231-525 | 39 | February 7, 2019 |
| 231-670 | 43 | February 7, 2019 |
| 231-760 | 27 | February 7, 2019 |
| 231-597 | 16 | February 7, 2019 |
| 231-855 | 22 | February 7, 2019 |
| 231-209 | 20 | February 7, 2019 |
| 231-146 | 19 | February 7, 2019 |
| 231-206 | 27 | February 7, 2019 |
| 231-114 | 2 | February 7, 2019 |
| 231-251 | 96 | February 7, 2019 |
| 231-775 | 12 | February 7, 2019 |
| 231-616 | 4 | February 6, 2019 |
| 231-888 | 9 | February 6, 2019 |
| 231-220 | 38 | February 6, 2019 |
| 231-946 | 13 | February 6, 2019 |
| 231-403 | 35 | February 6, 2019 |
| 231-587 | 10 | February 6, 2019 |
| 231-629 | 40 | February 6, 2019 |
| 231-690 | 32 | February 6, 2019 |
| 231-360 | 38 | February 6, 2019 |
| 231-348 | 8 | February 6, 2019 |
| 231-679 | 11 | February 6, 2019 |
| 231-570 | 25 | February 6, 2019 |
| 231-432 | 28 | February 6, 2019 |
| 231-485 | 1 | February 6, 2019 |
| 231-671 | 4 | February 6, 2019 |
| 231-987 | 9 | February 6, 2019 |
| 231-422 | 6 | February 6, 2019 |
| 231-598 | 14 | February 6, 2019 |
| 231-459 | 3 | February 6, 2019 |
| 231-754 | 6 | February 6, 2019 |
| 231-277 | 19 | February 6, 2019 |
| 231-465 | 7 | February 6, 2019 |
| 231-448 | 7 | February 5, 2019 |
| 231-920 | 37 | February 5, 2019 |
| 231-265 | 78 | February 5, 2019 |
| 231-633 | 16 | February 5, 2019 |
| 231-247 | 3 | February 5, 2019 |
| 231-409 | 35 | February 5, 2019 |
| 231-349 | 22 | February 5, 2019 |
| 231-421 | 13 | February 5, 2019 |
| 231-881 | 29 | February 5, 2019 |
| 231-527 | 11 | February 5, 2019 |
| 231-637 | 4 | February 5, 2019 |
| 231-262 | 2 | February 5, 2019 |
| 231-201 | 19 | February 5, 2019 |
| 231-216 | 209 | February 5, 2019 |
| 231-719 | 12 | February 5, 2019 |
| 231-314 | 2 | February 5, 2019 |
| 231-498 | 20 | February 5, 2019 |
| 231-930 | 22 | February 5, 2019 |
| 231-674 | 9 | February 4, 2019 |
| 231-606 | 3 | February 4, 2019 |
| 231-383 | 39 | February 4, 2019 |
| 231-533 | 20 | February 4, 2019 |
| 231-928 | 13 | February 4, 2019 |
| 231-239 | 30 | February 4, 2019 |
| 231-338 | 29 | February 4, 2019 |
| 231-388 | 13 | February 4, 2019 |
| 231-225 | 28 | February 4, 2019 |
| 231-745 | 8 | February 4, 2019 |
| 231-526 | 11 | February 4, 2019 |
| 231-295 | 7 | February 4, 2019 |
| 231-434 | 4 | February 4, 2019 |
| 231-250 | 26 | February 3, 2019 |
| 231-720 | 8 | February 2, 2019 |
| 231-454 | 4 | February 2, 2019 |
| 231-843 | 15 | February 1, 2019 |
| 231-887 | 3 | February 1, 2019 |
| 231-698 | 3 | February 1, 2019 |
| 231-638 | 25 | February 1, 2019 |
| 231-366 | 13 | February 1, 2019 |
| 231-884 | 18 | February 1, 2019 |
| 231-489 | 8 | February 1, 2019 |
| 231-922 | 11 | February 1, 2019 |
| 231-832 | 29 | February 1, 2019 |
| 231-347 | 23 | February 1, 2019 |
| 231-795 | 1 | February 1, 2019 |
| 231-916 | 3 | February 1, 2019 |
| 231-271 | 9 | February 1, 2019 |
| 231-726 | 7 | February 1, 2019 |
| Type: General Purpose Code |
| Use: Geograpic |
| Location: MICHIGAN |
| Country: UNITED STATES |
| Service Date: 1999-06-05 |
| Service: - |
Other area codes serving MICHIGAN, UNITED STATES