Purchase a call from Germany? Actually there are pretty much facts to check out when you pick prepaid phone cards:

• Calling cards Expire.
  Regular sections are 2 weeks, a month, 6 months, or 12 months. Ordinarily all leftover minutes are lost when the card expires. (Though there are exceptions and on some calling cards international lost time can be gotten back by upgrading)
• Billing Advance.
  Don’t buy the cards that have minimum times of more than 1 minute. Decide on calling cards that have a one minute minimum and have a tiny billing advance. Low billing increments initiate at 6 seconds.
• Rounding off.
  So if your regular increment is 3 minutes and you make a 4 minute call - you will be paying for six minutes.
• Be watchful the Taxes.
  This is discussed above. To make it up calling cards that have a low per minute phone rate often have a extremely not small connection tariff or surcharge.
• Track if there exists a possible supply payment.
  Truly there MIGHT be a delivery payment to make if you are getting an actual plastic card. Usually this is the USPS company charge but it could be courier charge. Avoid low value cards if there is a supply charge.
• Investigate if there are currency fees in the dealing.
  Occasionally there runs across a financial cost – for instance if you order a $15 prepaid card there is no sense in paying a $15 extra for the fortune of spending for the card by Google Checkout. Boycott low value phone cards if they charge you for buying it. Your money is better spent elsewhere.