Update:
Finally sussed that Android is usually used on smartphones - the Artfone CS182 isn't one.
Ended up having an online chat with a Lebara agent (the Artfone is using a Lebara SIM). The agent asked for the number I've been calling. It turned out that there was a stray 2 in the middle of it, making it 12 digits rather than 11. The only callers who were getting through were those who got the number from my partner calling them.
I can't work out how I might have accidentally inserted the 2 into her entry in my phonebook, so the whole episode will remain a mystery.
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