Planning around uncertain mobile reception
A coverage map is a useful starting point. It is less useful as a promise that your phone will work beside the kitchen table.
Check your own network
Start with the property's location rather than the name of the nearest village. A rural postcode can cover more ground than you expect. Ofcom's Map Your Mobile lets you examine predicted coverage by network and distinguish indoor from outdoor reception. Treat the result as an indication: the building, surrounding terrain and conditions on the day can affect what happens on your handset.
Ask the owner which networks guests have recently used successfully inside. An answer such as “calls usually work by the sitting-room window” tells you more than “signal available”. If the connection is essential, explain what you need to do. Receiving an occasional text is a different requirement from taking a lengthy call without stepping outside.
Prepare the useful information
Save the arrival directions, key instructions and booking contact before travelling. Make them available offline on more than one person's phone, or carry a paper copy. Do the same for any essential tickets. This is convenient even where reception is normally good because it removes one task from arrival.
Check whether the cottage has broadband and whether your handset and provider support Wi-Fi calling. Do not assume that a Wi-Fi symbol means every calling feature will work automatically. Set up any supported feature before leaving home, following your provider's instructions, and know how you will reach the property manager if the broadband is also unavailable.
Decide what matters
Patchy reception may be a welcome part of a weekend when you only want to check messages occasionally. It is a more significant limitation if someone must remain contactable for work or family responsibilities. Agree that distinction with your travelling companions before booking.
For an important commitment, have a realistic alternative rather than a vague plan to find signal somewhere. That might mean choosing a different cottage or arranging to take the call before reaching it. A holiday works better when the connection matches your needs than when everyone spends the first evening testing corners of the garden.