1.   Before our trip, I had made phone reservations at a small hotel in Guanajuato, and the desk attendant giggled when I asked about paying in advance.

2.   I then made a phone reservation, which took the same amount of time, about two minutes.

3.   It is the areas most heavily in demand that are on phone reservations.

4.   Note that they may charge an extra fee for phone reservations, cutting into your savings.