| Abbreviation | Definition |
|---|---|
| HSD | High Speed Data |
| HSDPA | High-Speed Downlink Packet Access |
| HSOPA | High-Speed OFDM (Orthogonal Frequency Division Multiplexing) Packet Access |
| HSPA | High Speed Packet Access |
| HSS | Home Subscriber Server |
| HSUPA | High-Speed Uplink Packet Access |
| HTHK | Hutchison Telecom Hong Kong |
| HTHK | Hutchison Telecommunications Hong Kong |
| HTI | Handoff Transfer Initiate |
| HTIS | Huawei Telecom Integrated Solutions |
| HTML | HyperText Markup Language |
| HTMT | Hinduja Technology Media Telecom |
| HTO | Hellenic Telecommunications |
| HTO | Hellenic Telecommunications Organization |
| HTU | HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit |
| HTU-C | HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Central office |
| HTU-R | HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Remote |
| HTV | Herschikking Telecom Veld |
| HU | Hook Up |
| HUACA | Hang Up And Call Again |