For calls to Singen (Hohentwiel) please enter the dialling code 07731 and then the number of the person or household you want to reach.
| 07731 | Phone Code: Classic spelling |
|---|---|
| +497731 | With german country code +49 |
| +49(0)7731 | With country code +49 and optional 0 |
| 00497731 | With country code 0049 |
| (07731) | Telephone code in brackets |
| 07731- | With hyphen as separator to the phone number |
| 07731/ | With slash as a separator to the phone number |