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[inquisitor]

Originally Posted by willemijns

cost of roaming are expensive i suppose... oups it is more realistic than a supposition

I wouldn't say that roaming is that expensive, but given the low mobile termination fees in most toggle countries and the lack of roaming fees for inbound calls, Lyca definitely needs to keep an eye on roaming costs. Hence they will need to steer roaming traffic to those network on which they have the best wholesale conditions. Since roaming with the global IMSI is obviously bought from Vodafone NL (they actually supply the global IMSI), who in turn preferably use other Vodafone networks, it's not surprising that you cannot register on some network, at least not immediately.
I'm rather surprised that you can still use the global IMSI within a toggle country even if you have a national IMSI from the corresponding country. Once a subscriber has obtained a national IMSI by ordering a local number, roaming through the global IMSI should be blocked in that particular country in order to save costs.
With FreeTimeTelecom the global IMSI did not register in Germany, where they had a local IMSI from now defunct vistream/Telogic Germany. But I guess for toggle it's way more complicated because you would need to define allowed roaming networks for each subscriber individually based on each subscriber's activated local numbers/IMSIs and then you would need to permanently update Vodafone NL's HLR with these records.

@NFH
Have you tried registering on the British networks through the global IMSI?