| Abbreviation | Definition |
|---|---|
| UNO | Universal Network Operations |
| UNP | UN-Published |
| UNS | Universal Numbering System |
| UOS | Units Of Service |
| UPC | Universal Personal Communication |
| UPC | Usage Parameter Control |
| UPCU | Uplink Power Control Unit |
| UPMT | Universal Per-application Mobility management using Tunnels |
| UPP | Universal Phone Processor |
| UPPC | Up Path Power Control |
| UPT | Universal Personal Telecommunication |
| UPT | Universal Personal Telecommunications |
| UPT | Universityrsal Personal Telecommunications |
| UPTO | Union of Post and Telecommunication Officers |
| URC | Utility Reference Customer |
| URM | Uniform Redial Model |
| URR | UHF (Ultra-High Frequency) Radio Receiver |
| USA | Underground Service Alert |
| USD | Universal Service Directive |
| USF | Universal Service Fund |