Telephones in Grendon Underwood |
| Communio | 01442 345600 | | 1 Frogmore Road, Frogmore Road Industrial Estate, Hemel Hempstead, HP3 9TG |  Map & Directions |
| A T Communications | 0870 600 6200 | | Thame Road, Haddenham, Aylesbury, HP17 8LJ | | Map & Directions |
| Frame Communications Ltd | 01296 399013 | | Litton House, 52-56 Buckingham Street, Aylesbury, HP20 2LL | | Map & Directions |
| Fulcrum Systems | 01494 437575 | | Hillbottom Road, Sands Industrial Estate, High Wycombe, HP12 4HJ | | Map & Directions |
| Orange Retail | 01442 244001 | | Unit 10, The Marlowes Centre, Marlowes, Hemel Hempstead, HP1 1DX | | Map & Directions |
| In Touch Technologies | 0845 644 2401 | | Unit 11b Akeman Business Park, Akeman Street, Tring, HP23 6AF | | Map & Directions |
| V Tech Communications Ltd | 01494 522500 | | 9 Hughenden Avenue, Manor Courtyard, High Wycombe, HP13 5RE | | Map & Directions |
| Dacon Electronics Plc | 01442 233222 | | Unit 1, Enterprise Way, Hemel Hempstead Industrial Estate, Hemel Hempstead, HP2 7YJ | | Map & Directions |
| A K D Communications Ltd | 01296 631101 | | 51 Beechwood Way, Aston Clinton, Aylesbury, HP22 5JW | | Map & Directions |
| Advanced Technology | 01442 244902 | | 1 Johnson Court, Hemel Hempstead, HP3 9JT | | Map & Directions |
| Sigma Wireless Ltd | 01296 505505 | | 6 Gatehouse Way, Bridgegate Business Park, Gatehouse Industrial Area, Aylesbury, HP19 8XN | | Map & Directions |
| G C S M D Ltd | 01494 431441 | | Seclusion, North Road, Chesham Bois, Amersham, HP6 5NA | | Map & Directions |
|
|
