I recently had the opportunity to speak to a senior Lycamobile representative who told me that it was decided to no longer actively market toggle and that it will probably be phased out at some point of time. He cited the failure to attract high-volume customers and the unreliability of the automatic IMSI switching performed by the STK application as main concerns that have led to the decision. As an alternative he suggested
Lyca 2 in 1 which however is only available to British Lycamobile SIM cards that can have a Polish and Irish MSISDN/IMSI added. Funnily this service again relies on STK for IMSI switching.