Area Code 170 – Mobile Network
The phone area code for Mobile Network is 170 (international format +49170). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 170
Select a central office code to view local carrier data and detailed information
Overview of Germany's +49 170 Mobile Prefix
The +49 170 prefix is a non-geographic mobile code assigned to Germany's cellular network. Unlike geographic area codes, which correspond to specific cities or regions, 170 is part of the national mobile numbering plan and is not tied to any physical location. This means that a call to a +49 170 number reaches the subscriber's mobile device, regardless of where in Germany (or the world) they are currently located. The prefix is widely recognized as one of the original German mobile codes, introduced in the early 1990s alongside other legacy prefixes such as 171, 172, and 173.
Technical Format and Dialing Procedures
German mobile numbers using the 170 prefix follow the E.164 international format: +49 170 xxxxxxx. The complete national significant number (NSN) is 11 digits long, comprising the mobile prefix (170) followed by an eight-digit subscriber number. When dialing domestically from a German fixed or mobile line, callers must use the national trunk prefix 0, resulting in the format 0170 xxxxxxx. International callers should omit the leading zero and dial +49 170 xxxxxxx (or the appropriate international access code from their country, e.g., 011 from the US). For example, a typical number might be +49 170 12345678.
Carrier and Portability Considerations
The 170 prefix was originally allocated to T-Mobile (now Telekom Deutschland). However, due to mobile number portability (MNP), subscribers can retain their 170 numbers when switching to other German mobile network operators (MNOs) or mobile virtual network operators (MVNOs). Therefore, the prefix alone does not guarantee the current network operator; it only indicates the original allocation. When routing calls or sending SMS messages to a 170 number, the German central routing database ensures that the call is directed to the current network of the subscriber, regardless of the original prefix.
Usage and International Roaming
Numbers with the 170 prefix are used for standard mobile voice calls, SMS, MMS, and mobile data services. They are fully integrated into the German mobile network and support international roaming, allowing subscribers to use their numbers abroad. For international callers, dialing a German mobile number is straightforward, but it is important to note that the caller will be charged according to their own operator's international rates. For SMS, the same international format (+49 170...) is used. As with all German mobile numbers, there are no geographic restrictions, and the numbers are not tied to any specific city or region.