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SimQuadrat offers own mobile numbers and supports SMS in Roaming.


I have tested a new product by SipGate called SimQuadrat for about 4 months so far. The service was initially launched as a mobile phone service with a geographic german phone number. Recently SimQuadrat added the possibility to add a mobile number for free. The system even allows to select from a few numbers during the subscription process.

As SMS transmission didn’t work in Roaming (tested in Luxembourg), I was curious and tested SMS transmission using my new mobile number. The SMS to a LuxGSM number arrived within a minute. I retested the transmission using my geographic number on the SIM card, delivery to LuxGSM worked fine as well. Unfortunately LuxGSM can only reach SimQuadrat mobile number via SMS, the geographic number are unreachable by SMS from LuxGSM.


  1. How does SimQuadrat work technically? I mean, how can they do it that you don’t pay roaming charges abroad? And does this also work for 3G data?

    • SimQuadrat doesn’t charge roaming-in fees to the enduser during the first 28 days of their stay outside Germany. Nowhere has SimQuadrat stated that they don’t pay roaming-in fees. SimQuadrat charges roaming-out fees to the end-user and they also pay roaming-out fees. The charges are however lower than you would expect.

      So how exactly is this possible? Well actually a roaming-in call within Europe doesn’t cost SimQuadrat much more than a few EURcent (except in Luxembourg, where it’s still around 7-11 EURcent/min). Roaming-in in Austria can be as cheap as 2.01 EURcent/min for SimQuadrat. So that still isn’t free but SimQuadrat is paid for the call towards your phone number (fixed or mobile), around 0.6 EURcent/min for calls to geographic numbers and around 1.79 EURcent/min for calls to mobile numbers. So on roaming-in they may have some loss.

      Now for roaming-out things aren’t that tight (for SimQuadrat’s profit). Example: calls from France to Austria fixed are charged 12.9 EURcent/min. Costs to call Austria fixed are less than 1 EURcent/min, that leaves 11.9 EURcent/min to pay for the mobile network usage in France are probably around 5 EURcent/min (estimation, I couldn’t find the relevant Reference Offers), that leaves around 6.9 EURcent/min for SimQuadrat.

  2. Thanks, Marc. I’ll give it a try. A pity you have to “return” to Germany every 28 days though. Is it enough to just “touch” the German home network every 28 days, or do you need to place or receive a call there? Seems they are using E-Plus.

    • Your mobile phone has to book into it’s home network (E-Plus in case of SimQuadrat) to restart the 28 days. Depending on your location, you may be able to do so several kilometers outside of Germany (depending on the topography and other aspects). At least that’s how it worked for me for the last 4 months.

  3. Lux City is probably too far. I’ll try in Munsbach but I doubt it will work. How far on the A1 should one have to go?

    • It really depends on a lot of variables (time of day, weather, time of year, sunspots, etc) beside your location. A manual network search in Munsbach probably won’t fetch E-Plus. From my observations (I haven’t been monitoring for that purpose specifically, so YMMV) you probably won’t fetch E-Plus before Flaxweiler or even Potaschbierg. A mobile network might even reject your registration attempt if your mobile report a signal below a certain threshold, so even if the network is already visible during a manual search you won’t be able to book into the network.

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