In Germany I can recommend Congstar.de. But it depends whether you have a huge data transfer volume or you just want to stay online with the cellphone. My data plan costs just 2€ per month, but is has only 100MBytes transfer volume. After reaching this limit the speed is only slowing down on a modem-speed, but I`m staying still online. Its enough for WhatsApp or mailing, but not for really fast surfing.
Cheers
Jörg
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