Need to try a Japanese SIM card - please help! (URGENT)

Hi everyone,

My name is Sachi and I am a Japanese-Canadian music teacher. I have been working at international schools abroad and I currently live in China. I'm moving to Kyoto with my partner at the end of July, and we are trying to figure out the cellphone situation.

We bought our cellphones in China, and after big struggles we finally figured out that they are not locked. We will be able to use them in Japan as long as Japanese SIM card works on our phones. The problem is that there is no way to check if it will or not until we insert one, and the stores won't let us try it until we buy one. (We called many companies and they all said the same.) We just need a kind person to lend us a working Japanese SIM card for few minutes so that we can try it on our phones. We don't want to pay for the SIM card and find out that it doesn't work with our phones... (Our phones are Samsung Galaxy Duos GT-S7562)

I will be staying at a hotel close to Fukakusa station in Fushimi-ku for a week from the 28th of July to look for an apartment. Please message me here if you will be able to meet up with me to help me with this on the 29th or the 30th. I speak Japanese too so if I can help you with something in return, I will be more than happy to do so.

Thank you!!
Sachi