We reserve the right, at our sole discretion, to withdraw or modify our service and all services or materials we provide through the Service, without notice. We will not be liable if, for any reason, all or part of the service is not available at any time or for a certain period of time. From time to time, we may limit access to certain parts of the service or to the entire service to users, including registered users. 17.4 Beware. Any communication that is to be heard must be provided in a sufficient manner when it is sent manually, to the transmission of perisimile or to the mail At the addresses indicated in the order form, provided that a copy of all legal instructions addressed to PCCW Global is also sent to the fax number (703) 621-1621. Such a notification is deemed to be received: a) when it is delivered by hand, when it is delivered; (b) if, by mail, three (3) days after publication or seven (7) days after publication, if they are reserved for one or the other place outside the recipient`s country of origin; and (c) when the sender receives a faxed transmission report at the time of delivery, confirming that the facsimile has been sent in full to the recipient`s fax number. Our inability to enforce a right or provision of these conditions is not considered a waiver of those rights. If a provision of these conditions is declared invalid or unenforceable by a court, the other provisions of these conditions will remain in force. These terms represent the whole agreement between us regarding our service and replace all previous agreements that we could have had between us with respect to the service. 17.5 Full understanding. This agreement represents the entire agreement between the parties with respect to services and replaces all agreements, assurances and prior agreements of the parties, both written and orally, regarding these services. For the conclusion of this agreement, the parties do not rely on insurance or guarantees regarding a service, unless expressly provided for in this agreement.