If a telephone number is used illegally, the Federal Network Agency can intervene and take appropriate measures. A number may be misused if you are put on hold under a chargeable number and your request is not processed. a company only provides a high-priced number as a telephone contact for contractual questions you receive a recorded message on the telephone which is intended to entice you to call back, e.g. by informing you of an alleged prize. you are confronted with annoying calling behaviour, e.g. advertising calls on Sundays and public holidays Confusing, missing or incorrect price information about the connection costs when dialling an expensive number (e.g. (0)900 numbers, (0)180 numbers). At the beginning of a telephone call after dialing expensive numbers or after dialing call-by-call numbers, no or an incorrect price announcement is given. No price announcement for the connection costs of the transferred call is announced when the call is transferred by a directory enquiries service. In the case of a call to a (0)900 number, there is no forced disconnection of the connection on the network side after one hour. in postal advertising letters, the addressee is misled to a considerable extent with the purpose of submitting a reply under the specified call number you receive unsolicited advertising SMS or other electronic advertising messages via Messenger (for example via Facebook, Whatsapp, SIMSme, Threema or Line). You receive e-mail spam in which telephone numbers are advertised (unsolicited advertising e-mails). You receive fax spam, i.e. unsolicited promotional faxes. you receive ping calls, i.e. calls where the phone has only rung briefly for the purpose of provoking a callback a mobile phone or Internet dialer automatically connects you to expensive numbers from your connection your internet router or telephone system has been hacked by a third party and as a result connections with costs are generated or you are billed for inexplicable items such as subscription services on your telephone bill. Proven illegal use of the telephone number can be punished, depending on the extent of the violation, by: reprimand or warning, ordering the disconnection of telephone numbers, Billing and collection bans, porting bans, business model prohibition or Switching bans. In order to combat number misuse, you should provide the Federal Network Agency with as detailed information as possible on the facts of the number misuse. Existing documents such as itemised bills or screenshots of websites visited should be enclosed.