Prepaid mobile cards
Using my HK mobile SIM in the US is really annoying. I can’t make outgoing calls. I can send SMS, but most people’s phones here are not configured correctly to send an international SMS back to me. I can receive incoming calls that cost me something like US$3 a minute. But I’d need a huge deposit to make things work correctly, or the chance to buy a T-Mobile or AT&T SIM card (which I have yet to have).