Selective blocking to protect against costs; blocking in the case of payment default

(1) End users may require the provider of voice communications services, the provider of internet access services, and the provider of the connection to the public telecommunications network to block, on the network side and free of charge, use of their network access for specified telephone number ranges within the meaning of section 3, point 50, and for short code services, insofar as this is technically possible. Unblocking of the blocked telephone number ranges and short code services may be subject to a charge.
(2) End users may require the provider of publicly available mobile services and the provider of the connection to the public mobile network to block, on the network side and free of charge, identification of their mobile connection for the purpose of taking up and billing a service provided alongside the call.
(3) Providers of voice communications services and providers of internet access services may, without prejudice to other statutory provisions, refuse services owed to a consumer, in whole or in part, by means of a block only in accordance with the following subsections. Section 164(1) remains unaffected.
(4) On account of the consumer's payment default, the provider may carry out a block where the consumer, in the case of repeated non-payment and after deduction of any advance payments, is in default with payment obligations of at least EUR 100. The provider must give written notice of the block at least two weeks in advance, and in doing so must draw attention to the consumer's ability to seek legal protection before the courts. In calculating the amount under the first sentence, uncontested claims that the consumer has objected to in proper form, in good time, and with a coherent statement of reasons are disregarded. Likewise disregarded are unadjudicated disputed claims of third parties. This also applies where such claims have been assigned.
(5) The provider may carry out a block where there is a reasonable suspicion that the end user's connection is being used abusively or manipulated by third parties.
(6) The block must be limited to the services affected by the payment default or abuse. In the case of disputed high invoices for value-added services, the consumer must continue to be given access to a minimum offering of voice communications services and broadband internet access services. Where the payment default relates to a service that is part of a bundled offer, the provider may block only the affected component of the bundled offer. A full block also covering incoming voice communications may take effect no earlier than one week after blocking of outgoing voice communications.
(7) The block may be maintained only for as long as the reason for it continues to exist.