Since the introduction of Mobile number portability in 2002, the prefix (here 0178) is no longer a indicator for the mobile radio network.
Originally, the phone code 0178 was assigned to O2 (ehemals E-Plus). Currently, however, this can be used or be active in a different german network.
Which provider is that?
The same applies to the provider. Originally to O2 (ehemals E-Plus) assigned can this number theoretically be in use at every other german mobile provider.
Call a german 0178 mobile number from abroad
To call a mobile number with the prefix 0178 from abroad, you must dial the area code for Germany (+49 and 0049) at the front. In addition, you have to remove the 0 from mobile phone code. The final phone number then has the following form: +49178...