Quote from: Frodo on December 28, 2011, 02:01:19 PMTo call Germany cell phone, I buy calling cards, but it still costs me about 25c per min.
Are you really spending 30 (min./day) times 20 (bus. days/mo.) times $0.25/min. = $150/mo., just for Germany?
There are many better choices. Cheapest are the Betamax companies; list is here
http://backsla.sh/betamax (prices in Euro cent/min.) Lowest to DE mobile is Intervoip; $0.029/min. Quality and reliability are not the best, but your usage is so high, you may want to risk €5, to see if it meets your needs.
Next step up is Localphone; $0.069/min. to DE mobile. You get a few minutes of free credit at signup, so you can test without making a payment or supplying any financial info.
If your contact in DE has a cell plan with lots of minutes, you might try Rebtel. Your contact calls you back on the local number provided and the call is free (except for cellular airtime).
Any of the above can be used as calling cards, with an OBi or other VoIP hardware, or with softphone, smartphone app, etc.
If you buy a couple of OBi devices, you'll have free calling between them, and to US numbers with Google Voice. You could add additional providers for 911, or for inexpensive calling to UK; several are less than $0.01/min.
You might also look at the offerings of VOIPo or Phonepower; though not cheap, they are much less expensive than Vonage, have good support, and include a "cloned line" feature, so you could make and receive calls while another family member is on the phone.
Although somewhat of a hassle to set up, Voxbeam (Premium route) may meet some of your requirements. Quality is IMO quite high; UK landline is $0.0058/min, DE mobile is $0.0502 - $0.0521, depending on carrier. You get a small credit at signup; until you get your OBi, you could test with a free softphone.