I am not sure if its to any help for you...
I used this site to find options for simcard when i was traveling in asia during this spring. For all the countries l visited the site presented accurate and up to date information.
http://prepaid-data-sim-card.wikia.com/wiki/China
But indeed it seems to be a bit complicated...
Also i feel its a bit like a x/y problem... What are you really trying to do? What are these SMS varifications codes? Could you use another way? Bankid? Microsoft Authenticator app?
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