Before traveling, I used a phone card and a software called worry-free travel. There is not much to say about replacing a local sim, that is, it is convenient to buy a local card to make local calls to the Internet, but it is difficult to contact domestic calls, and roaming charges can make you feel distressed.

China Mobile's worry-free service can solve the problems of local sim cards: First, provide traffic at low cost; Second, when you make a phone call, you will be given 100 minutes as soon as you register, and the cost of 100 minutes is quite low; Third, you can host domestic calls, and answering calls and text messages is free, which is equivalent to answering calls with a local sim card for free.

In fact, calling is realized by VoIP. Its advantage is that the other party displays the local phone number. In other words, generally you don't take the initiative to say that the other party doesn't even know where you are, let alone that you are calling him from abroad. This is more intimate for business people, it can show your original number, otherwise a foreign phone may be hacked directly.

Anyway, it took a few days of traffic and phone calls when traveling, and I deeply felt the convenience of worry-free travel. After some publicity, friends and colleagues around me are now using this. Recently, I found that his app has been upgraded, and now I can host domestic calls. Now you can receive text messages and phone calls directly when you go abroad. The key is still free. I don't want a penny. I have to say, this move is really sweet. Don't worry about communication traffic when you go out in the future.

Therefore, if you travel to Singapore for a week, I suggest you use the worry-free app, which is very cool and can leave you a lot of communication expenses.