| 256 | Uganda | 0.135 | 0.105 |
| 2567, 25671, 25675-78 | Uganda - Mobile Celtel | 0.145 | 0.115 |
| 380 | Ukraine | 0.105 | 0.085 |
| 38044 | Ukraine - Kiev | 0.100 | 0.08 |
| 38039, 38050, 38063, 38066-68, 38095-97 | Ukraine - Mobile | 0.140 | 0.11 |
| 971 | United Arab Emirates | 0.190 | 0.155 |
| 97150 | United Arab Emirates - Mobile | 0.190 | 0.155 |
| 44 | United Kingdom | 0.030 | FREE |
| 447 | United Kingdom - Mobile | 0.295 | 0.25 |
| 449 | United Kingdom - NGN | 3.300 | 3 |
| 448 | United Kingdom - Special | 0.440 | 0.39 |
| 598 | Uruguay | 0.085 | 0.065 |
| 5989 | Uruguay - Mobile | 0.215 | 0.18 |
| 5982 | Uruguay - Montevideo | 0.075 | 0.055 |
| 1340 | US Virgin Islands | 0.030 | FREE |
| 1 | USA (48 states) | 0.030 | FREE |
| 1907 | USA - Alaska | 0.055 | 0.035 |
| 1808 | USA - Hawaii | 0.045 | 0.025 |
| 1787 | USA - Puerto Rico | 0.030 | FREE |
| 998 | Uzbekistan | 0.090 | 0.07 |