How does Unicom open global communication?

Unicom can't open global communication.

GSM is a package of China Mobile, and Unicom users cannot handle it. If Unicom users need to use it abroad, they need to open international roaming services in corresponding countries and regions.

China Unicom prepaid users do not need to apply, and Unicom will open international roaming services in Hong Kong, Macao, Taiwan, Malaysia, South Korea, Vietnam and other regions and countries by default.

Extended data:

Scope of use of GSM:

International Zone 1: Singapore, Cyprus, Bahrain and Tunisia.

International Zone 2: Vietnam, Bangladesh, Korea, Japan, Iran, Greece, Crete, Ghana, Nigeria, South Africa, Sierra Leone, Mozambique, Guam and Saipan.

International Zone 3: Thailand, Laos, Oman, Yemen, Cambodia, Maldives, Pakistan, France, Netherlands, Norway, Sierra Leone, Lofoton Islands, West Oran Islands, Malta, Uruguay, Fiji, Canada, USA, Virgin Islands, Puerto Rico, Grenadines, Hawaii, New Zealand, Egypt and Germany.

International Zone 4: Austria, Nepal, Saudi Arabia, United Arab Emirates, Jordan, Lebanon, Finland, Slovakia, Romania, Luxembourg, Allen Island (Oran Island), Sudan, Uganda, Rwanda, Iraq, Niger, Austria MOBILKOM (A 1) and Austria T-Mobile.

International five regions: Britain, Hungary, Spain, Australia, Afghanistan, Syria, Qatar, Isle of Man, Georgia, West Africa, South Biferland, Monaco, San Marino, Corsica, Ionia, Peloponnesus, Sweden, etc.

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