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o2 Germany have a special offer:

On
www.o2-freikarte.de

you can order up to 4 numbers o2 SIM for free.
They come with a balance of 1€ each and are valid 1 month.
Within that month you need to top up (possible via bank transfer) to extend the validity to 6 month.
I suppose a top up of 1ct (!) is enough to extend the validity, as this is the typical o2 procedure.

Rates are not too bad: 15ct/min to all german networks and landline.

Just enter Name, german address and email to receive up to 4 pcs.
For details to top up via bank transfer send a SMS (any content) to 56656