I would like to get a surf stick from Alditalk! But do not buy a new SIM card right now! So I would use those, where I'm called!
Wireless Internet access?
Wi-Fi through the surfstick!
The alendurf sticks are branded and can only be used with the aldikarte. If you just want to surf then it's best to set up a hotspot on your mobile phone and connect it to your computer via Wi-Fi. Then you can also continue calling.
If that is not your solution then buy a free surfstick. Then you can receive the call s.Calculator, but need suitable software then the stick should be there.
That would go, for example:
Huawei E3531 SurfStick (HSPA +, USB, HSUPA, EDGE / GPRS) white https://www.amazon.de/...00HSZEY34/