German MVNE Telogic (fomerly known as vistream), the company behind solomo, has declared insolvency as of July 25th. Customers report failure of many services including reachability from other networks and failure of Internet access as well as outgoing calls (see
Telogic in vorläufiger Insolvenz: vistream-Nachfolger abgeklemmt - teltarif.de News).
So SIM cards should better not be recharged anymore as the money may get lost.