It appears now that Localphone.com has the lowest international mobile calling rates on a per-minute basis.
http://www.localphone.com/prices
Localphone.com is a SIP-based VoIP provider and can integrate with Asterisk. It should be possible to use many of the available SIP dialers, but Localphone.com recommends X-Lite from CounterPath and provides configuration instructions.
http://www.counterpath.com/x-lite.html
http://help.localphone.com/voip/devices/softphone/xlite
Vonage has announced a new plan, World Premium Unlimited, that includes calling to mobile numbers in most countries at no additional cost above the monthly rate.
http://www.vonage.com/world-calling-plans/premium-unlimited-international/
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