giffgaff t&cs https://giffgaff.com/terms#ProvisionofService
2.1 We will provide the Service to you, and you will be entitled to the quality of Service generally provided by a competent mobile telecommunications service provider exercising reasonable skill and care. However, the Service is not fault free and we will not be liable to you if it is impaired by geographic, atmospheric, Network traffic or other conditions or circumstances beyond our control, including but not limited to the following:
a) The Service is subject to Network coverage and is not available in all parts of the United Kingdom, the EU and selected destinations or in all other countries; and
b) The Network may from time to time require upgrading, modification, maintenance or other work which may result in partial or complete non-availability of the Service.
No compensation will be offered, nor is there any entitlement to compensation