AT&T also imposes a monthly Regulatory Cost Recovery Charge of up to $1.25 to help defray costs incurred in complying with state and federal telecom regulations; State and Federal Universal Service Charges; and surcharges for customer-based and revenue-based state and local assessments on AT&T. These are not taxes or government-required charges. Free nationwide domestic long distance includes calls made from the 50 U.S. states, Puerto Rico, and the U.S. Virgin Islands to the 50 U.S. states, Puerto Rico/U.S. Virgin islands, Guam, and Northern Mariana Islands. Roaming charges do not apply when roaming within the service area of land-based networks of the 50 U.S. states, Puerto Rico/U.S. Virgin isles (if you go to Guam and Northern Mariana Islands you are roaming internationally). Nights and Weekend and Mobile to Mobile minutes apply to calls that originate while in the nation plan coverage area (including AT&T’s network as well as our GSM roaming partners' networks). See AT&T Maps. Calls are rated based on the time zone of the call's point of origin. Nights are from 9:00 p.m. to 5:59 a.m., Monday-Friday, and Weekends from 9:00 p.m. Friday to 5:59 a.m. Monday, based on the customer's location when the call was placed. The Unlimited Mobile to Mobile feature is considered a promotional offering. International calling incurs long distance charges and International roaming incurs roaming charges. Reduced international rates are available as an account feature.