In my personal experience, I bought a Three SIM card for some testing, and in about a month after not using the SIM for anything besides calling one of my own n

In my personal experience, I bought a Three SIM card for some testing, and in about a month after not using the SIM for anything besides calling one of my own numbers I started receiving marketing calls. The marketer was upfront about how Three will give out your number to advertisers. The only redeeming quality they have is their US data plan.