Give them a cellphone number, but tell them you might no be available over extended periods, because you don't know how good the coverage is at the place you are going to. Then switch it off whenever you don't want to be disturbed, but in case they called, call back several hours later, or the next day, or whenever you feel like it.

Give them a cellphone number, but tell them you might not be available over extended periods, because you don't know how good the coverage is at the place you are going to. Then switch it off whenever you don't want to be disturbed, but in case they called, call back several hours later, or the next day, or whenever you feel like it.