What kind of mobile phone card is more cost-effective abroad?

When buying a mobile phone card abroad, you can choose to use China Mobile roaming. T-mobile signal should be chosen, which is much cheaper. Many mobile phones can set this signal as mandatory. When you arrive in the local area, you will receive a tariff notice: dial local direct dial 0.59 yuan, dial domestic +86 plus the number 0.99, answer 0.99, and send a domestic short message 0. 19.

You can also choose mobile GSM, which is 0.99 yuan for domestic calls and telephone calls and 0.59 yuan for local calls (RMB).

You can also choose Unicom's WCDMA, which is not supported by dozens of countries around the world. Mobile phone manufacturers all over the world strongly support it, and so do all kinds of smart phones. Many models and moderate prices. The fastest transmission speed of WCDMA network is 7.2M WCDMA is fully compatible with 2G GSM, and it will automatically switch to 2G network where there is no 3G signal. Video calls are very effective, and mobile TV is also very smooth.