OPEX Long Distance Service, proudly offered by SierraSavings.com, provides US-based companies and individuals with quality, inexpensive domestic and international long distance telephone service.

$2 billing fee if your monthly usage is less then $20. $2/month for the first inbound toll free line, and 53¢ for each additional inbound line.

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Terms of this service are subject to Cognigen policies and its carriers' tariffs. State-to-State rates,In-State rates, and minimum usage fee may vary based on your location. Up to 100 free state-to-state minutes will be credited on your sixth month's bill. Calls to HI, AK, PR, Guam, and USVI are 23 cents/min. Minimum usage fee may vary and applies if usage is less than $20.00. $2.00/mo fee for inbound toll free service, per account. FCC imposed USF fee of 8.7% and a PICC fees apply: $3.25/line for additional Commercial lines (the first commercial line and all residential lines are free of charge). All residential orders for customers in California and South Dakota must be voice verified regardless of whether or not an offline order has been submitted.