Berlin is 8 hours ahead of Phoenix during standard time. Phoenix uses Mountain Standard Time (MST, UTC-7) while Berlin uses Central European Time (CET, UTC+1). When it's 12:00 PM in Phoenix, it's 8:00 PM in Berlin.
Importantly, Arizona (except Navajo Nation) does not observe daylight saving time. During Berlin's summer time (CEST), the difference increases to 9 hours.
Best calling time: 7:00 AM - 9:00 AM Phoenix time. This corresponds to 3:00 PM - 5:00 PM in Berlin (or 4:00 PM - 6:00 PM during CEST).
Phoenix's lack of daylight saving time makes it unique among major US cities. During summer months, Phoenix is on the same time as California despite being in the Mountain time zone.