To be honest, I'm not a brightest tool in the shed.

I'm going to HK for a week. I have an unlocked Andriod Phone from Tmobile (USA). I basically need a local HK number with SIM. I'll use it to make occasional calls to the USA and within HK (if I get lost), but mainly for someone in the USA to call/find me.

What should I do and which SIM/plan should I buy?

Thanks for repeating the information again....