No, that's not an Embraer plane or Mercedes car. It's a Huawei modem.

Long story short: I had an E220 locked to 3 UK, which worked fine. After forgetting it in a hotel room in PRG, and despite them having found it and keeping it till I come back, I decided to buy an unlocked E172 so that I could use it with other SIMs abroad as well as not having it hanging off the laptop (the E172 is a USB stick). This works fine but it really buggers the sims I put in...so after a week or so, my connection will start getting broken every half an hour or so. It reconnects and works fine until it breaks again and so on...it gets worse and I need a new sim by the time my 30-day allowance is running out (by then it's breaking every 3-5 mins). They're free but this whole saga is a PITA.
Anything I can do to reduce wear? I need the connection most of the day, so turning it off isn't a great option...