Ok, so my answer could be way off, but I had a friend who's daughter when over seas to work for a few years and they were asking me the same question. Instead of giving them that answer, I told them to check out skype

http://www.skype.com

If both ends of the line have skype, you can basically talk for free. The quality is better than land lines, and if you have webcams, you can see either other as well.

There are pay options to be able to have voice mail, or call out, or have people call in that don't have skype, etc... and the rates are really cheap.

Not sure if that is what you need it for, but if it is, my friends loved it and still use it. They actually bout some phones that were skype phones but worked like home telephones so they didn't even have to be connected to the computer.

Anyways.. Good luck!
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you should mention your locaion for me to help you.
But you can buy credit from globe7.com and skype.com directly
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There are several places where you can buy phone cards which work between the US and Senegal. Here are a few links for you to peruse and they seem to have fair, low rates:

http://www.nobelcom.com/phone-cards/calling-Senegal-from-United-States-1-245.html

http://www.alosmart.com/Senegal-Cellular-calling-card-380.asp

http://www.phonecardsmile.com/phone_card_to/Senegal.html (This link has rechargeable phone card plans, too).
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http://www.onesuite.com/ (a site that I use regularly and one that does not have complicated charging rules or hidden fees) charges US$0.2550 per minute. They have 800 number access, local numbers throughout large swaths of the US, and you can buy over the Internet with Visa, Mastercard, and Paypal. Further, all their cards are rechargeable.

http://www.skype.com/ Only allows you to call from a computer on a broadband connection and charges $ 0.269 per minute to a land line and $ 0.300 to a mobile number in Senegal. They also mention a connection fee, but I was unable to find it. Since they are an EU business, your credit card issuer will also charge you an additional "Cross border fee" when you order from them (something I found out when I ordered an internet phone number from them).
Their unlimited world plan does not include Senegal

http://www.globe7.com/ is also a broadband/DSL only service. They charge $0.2253 in general, $0.2328 to mobile numbers, and $0.1469 to landlines in Dakar. I have never used them (I have used the above two), so I can't say how good their service is. I also don't know if they have any hidden fees. However, their FAQ site opened spam popup windows, which is not a good sign.
Source(s):
http://www.onesuite.com/rates.asp
http://www.skype.com/prices/callrates/
http://www.globe7.com/rateplan.php?lang=eng&code=S

Also personal experience with skype and onesuite

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Log on to Net2Phone.com
You can talk to Senegal for .24 cents a minute from a ground phone and .28 cents a minutes from a cell.
Source(s):
www.net2phone.com

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This is a new company, but they're pretty well known already and have tv commercials where I live. I use them sometimes for calls to Mexico because it's only 2 cents a minute. It says Senegal is .29 per minute. I don't know if that is good compared to others, but most of their rates are really good, so good luck.

www.pennytalk.com
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One word. Skype. You have a computer, so as long as they have one there, and you spring for a couple headsets, you are cooking with gas. So much cheaper than any other long distance workaround. Even if you need to call landlines, the subscription plans offer a $9.95/mo unlimited worldwide calling!
The video chats are really the next level in communication though, try to work towards that.
Source(s):
http://www.skype.com/

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