College students nationwide will be able to phone home for as little as 10 cents a minute this year. Sprint announced this week a student version its popular FONCARD. The calling card for college students now carries a rate of 10 cents a minute for weekday calls from 7 p.m. to 7 a.m. and all weekend long.  Weekday calls are 40 cents a minute. Students who average $25 or more in long-distance each month can participate in Sprint's Cool Rewards program, which allows them to redeem reward stamps for free long-distance and Sony Musica merchandise like music CDs, videos and much more.  Four times a year, students automatically receive reward stamps to redeem for prizes.  The Cool Rewards catalog is available on-line (www.sprint.com/college) or in print. The Sprint FONCARD also can be used for emergencies or when students are short of change for a pay phone.  There is a 26-cent charge for calls originating from a pay phone.  The FONCARD also provides a convenient way to keep track of long-distance calls because there is no need to split the phone bill with roommates. FONCARD usage can be billed to a credit card.  To use the card, students call 1-800-2SPRINT and follow the voice prompts.  There is also a collect calling option. The FONCARD also can be ordered through the Sprint Web site -- www.sprint.com/college -- and later this month through www.taponline.com, a popular Web site among college students.