- UHF (Ultra High Frequency)
- ULS (Universal Licensing System)
- Um
- UMTS (Universal Mobile Telecommunications System)
- Unbundling
- Uni-Directional Antenna
- Universal Bus Extender Board (UBEX)
- Universal Service
- UNIX
- Unvalidated Phone
- Uplink
- UPT (Universal Personal Telecommunications)
- Urban cells
- USAT (Ultra Small Aperture Terminal)
- User Links
- USIM (An upgrade of the SIM card)
- UTAM
- UTRA (UMTS Terrestrial Radio Access)
- UUT (Unit Under Test)
- UWC (Universal Wireless Consortium)
- UWC-136
- UWCC (Universal Wireless Communications Consortium)
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