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[inquisitor]

I've just found out that the iPhone - at least unless jailbroken - does not provide access to the SIM Toolkit (STK), but on any other phone you should find this item somewhere in the menu (old Nokias just call it "Services") or among the apps (Android). Once you start the STK, you will see a first item called "toggle". After selecting "toggle" in the next menu level you may chose between manual and automatic IMSI selection. There you would need to select manual IMSI selection, which will reveal a list of activate IMSIs for your SIM card. In your case it should list "Global", "UK" and "Poland". Here you would select "Global" and then perform a manual network search after which you would try to register on each of the listed networks. If your registration fails for a certain network retry it four times to rule out that it's just the steering mechanism which prevents you from registering.

[NFH]

I've tried in an old HTC HD2, and even with the global IMSI selected, it still won't register on other UK networks.

[inquisitor]

Originally Posted by NFH

I've tried in an old HTC HD2, and even with the global IMSI selected, it still won't register on other UK networks.

That makes sense. Since all toggle SIMs have a British IMSI and so can access O2 UK they have probably disabled roaming with the global IMSI in the UK. For the other countries it's more complicated because you would need to bar roaming based on each customer's set of IMSIs, which may be too complex at this time.

Originally Posted by willemijns

i'm not agree... i have a delightmobile based on KPN NL... i always have access
to the #1, #1 and #3 FR netwiorks.

The fact that KPN perhaps doesn't steer its roaming customers to a certain French network, doesn't mean that Vodafone NL gets the same wholesale prices on all French networks.

i know vodafone is affilied in some parts with SFR France but it is not a good reason !

Vodafone owned a 44% stake in SFR until 2011 when they sold it to Vivendi who are the sole owner now. But I could bet that they are still partnering with Vodafone like other independant MNOs do (e.g. Mobilkom Austria, Swisscom), especially for roaming wholesale. That's why SFR is surely Vodafone NL's and so toggle's (at least while using the global IMSI) cheapest roaming partner in France and thus their preferred network.

[inquisitor]

Originally Posted by inquisitor

I've just found out that the iPhone - at least unless jailbroken - does not provide access to the SIM Toolkit (STK),...

Correction: the iPhone does support the SIM Toolkit, which can be found under Home > Settings > Phone > SIM Applications.

[dg7feq]

Originally Posted by inquisitor

Correction: the iPhone does support the SIM Toolkit, which can be found under Home > Settings > Phone > SIM Applications.

the STK is often well hidden. I have a crappy Sony Ericcson phone here where the STK is sorted in "Fun and Games"... Oh well...