Can I initialize a SIM card when abroad?
score:8
Accepted answer
I went through some contacts and I got an answer form an engineer who oversees the roaming (at another provider's). Her answer is
yes, the card needs to be active on the local (national) network at least once so that it is registered with the HLR (Home Location Register). It then can roam.
I will take it as an authoritative answer.
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Source: stackoverflow.com
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