05121 is the area code for Hildesheim, Germany. From abroad, dial +49 5121, then the full local number, leaving out the first 0.
Within Germany, keep the first 0: 05121.
If the number already starts with +49, use it as written.
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Germany starting rates
These are starting rates for Germany. Your full number and selected caller ID determine the final rate, which you see before calling.
The 05121 area code serves the Hildesheim telephone area in Germany.
Telephone-area boundaries can cross municipal borders. Use the highlighted area below to check the coverage; the area name alone does not describe every place it serves.
05121 coverage area
Approximate coverage
Orange shows the approximate area served by 05121. Boundaries are simplified from Bundesnetzagentur’s official telephone-area data dated August 10, 2026. They follow the telephone area, which can differ from the city’s municipal boundary. It is a coverage guide, not an exact exchange-boundary survey. An area code does not show a caller’s current location.
Telephone boundaries: Bundesnetzagentur (free GIS reuse, including commercial software). Map geography and nearby city coordinates: Natural Earth (public domain).
Coverage references: Numbering authority.
05121 is a geographic area code, but it does not identify who is calling or prove where they are. People can keep numbers after moving or use internet calling.
Caller ID can be faked. If a caller claims to be a company you know, check independently using a number from its official website.
From abroad
+49 5121 [local number]
Within Germany
05121 [local number]
Replace [local number] with the complete local number you were given. Its length can vary.
From abroad, replace the first 0 with +49: start with +49 5121, then enter every digit of the local number. Within Germany, use 05121 followed by the local number when including the area code. German local numbers vary in length. Older, shorter numbers remain in use. Replace [local number] above with the full number you were given, without adding or removing subscriber digits.
In Talkala, enter the full number starting with +. If your phone service does not accept +, use its international access prefix instead. This varies by country and carrier.
Common questions
+49 is Germany’s country calling code, and 5121 is 05121 without its domestic opening 0. Add the complete local number to reach a geographic number in the Hildesheim telephone area. The prefix alone is not a complete phone number.
05121 is an area code used in Germany. The country calling code is +49.
Use +49 5121 [local number] for the international format. Replace [local number] with every digit of the number you were given; lengths vary.
Yes. Enter the full number in Talkala, check the rate, then sign in to call.
The person answering uses their usual phone and does not need Talkala. Even if the format is correct, the number may no longer be in use or reachable.
Numbering details checked Oct 19, 2026. Coverage is a general guide and may not list every place served.
Prices come from Talkala's published rates, updated May 12, 2026, using the default United States caller ID. The exact rate depends on your selected caller ID and full number.
