It is troublesome to SIM in other countries. You may even just stay in certain countries for just half day but you need mobile data for contacting the others. Now you can get one SIM card to solve this problem.
Poland Prepaid SIM Card Card Type:
【Unlimited mobile data / 14-day / 3G network】
【Unlimited mobile data / 30-day / 3G network】
Although it does not support with voice call, unlimited free SMS service is offered in all the above packages.
Other than Poland, all the above packages are applicable to the nearby European countries. No need to reset network when you move to another country, it will automatically search for the designated network in the country you are staying.
Lowest speed: 128Kbps
Leftover data can be used after arrival at Hong Kong.
【Unlimited mobile data / 14-day / 3G network】HK$ 298
【Unlimited mobile data / 30-day / 3G network】HK$ 398