Since the introduction of Mobile number portability in 2002, the prefix (here 01525) is no longer a indicator for the mobile radio network.
Originally, the phone code 01525 was assigned to Vodafone. 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 Vodafone assigned can this number theoretically be in use at every other german mobile provider.
Call a german 01525 mobile number from abroad
To call a mobile number with the prefix 01525 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: +491525...