For calls to Giesen bei Hildesheim please enter the dialling code 05121 and then the number of the person or household you want to reach.
| 05121 | Phone Code: Classic spelling |
|---|---|
| +495121 | With german country code +49 |
| +49(0)5121 | With country code +49 and optional 0 |
| 00495121 | With country code 0049 |
| (05121) | Telephone code in brackets |
| 05121- | With hyphen as separator to the phone number |
| 05121/ | With slash as a separator to the phone number |