Long Distance Post, a distributor of prepaid mobile phones, this week introduced a prepaid international cell phone service that allows users to talk on their phones overseas without incurring roaming charges.

Long Distance Post is offering international travelers a prepaid Subscriber Identity Module card, called OneSIMCard, which can be inserted in a phone and used overseas to make phone calls. OneSIMCard works in over 140 countries and provides up to 85% lower rates than other SIM cards on the market, according to the company.

The card is compatible with tri-band or quad-band phones that use GSM, GPRS, and 3G cellular technologies. OneSIMCard comes with subscriber information, security features, and storage.

The other option is to rent or buy a mobile phone with global capabilities that already has the card inserted. The renting option is best for those who plan to take a short trip abroad and need a phone for less than 15 days.

Long Distance Post said it doesn't charge customers a monthly fee for its service and allows them to keep a phone number as long as they need to. The company also offers options specifically for businesses that need to manage a fleet of mobile phones overseas. Businesses can view or change their employees' card balances, set SIM card options, block or unlock a SIM card, reassign cards to new users, or send text messages to groups of people.

The standalone SIM card costs $40 and includes a $10 initial airtime balance. Cell phones sold by Long Distance Post with OneSIMCard already included start at $99.95 (for a Siemens A70 tri-band global phone). Weekly fees for renting a mobile phone from Long Distance Post range depending on the phone model selected.