Question about Huawei E5770

I can recommend this website for country-specific information on this:
http://prepaid-data-sim-card.wikia.com/wiki
The website often knows more than the salespeople in the local telecom shops, which has helped me save a lot of money.

One possibility would be the SWISS SIM card. You can load credit onto it and buy data packages. And because it's a trusted provider, there's no risk of losing your credit. I've been using it for a while now. There are certainly cheaper options, e.g. with Yallo, but this one is safe: https://www.swiss.com/CH...