{"id":21137,"date":"2025-10-01T00:00:11","date_gmt":"2025-09-30T16:00:11","guid":{"rendered":"https:\/\/beyond-shenzhen.cn\/?post_type=blog&p=21137"},"modified":"2026-04-22T13:19:49","modified_gmt":"2026-04-22T05:19:49","slug":"china-unicom-foreigner","status":"publish","type":"blog","link":"https:\/\/beyond-shenzhen.cn\/en\/blog\/china-unicom-foreigner\/","title":{"rendered":"\u3010SIM\u3011China Unicom Recommended for Foreigners in China"},"content":{"rendered":"

China has three major telecom carriers: China Mobile, China Telecom, and China Unicom.<\/p>\n

For foreigners living or working in China, getting a mobile SIM card is a must\u2014but the question “which carrier to choose” soon follows.<\/p>\n

Unlike in Japan, where carriers offer fairly similar services, China\u2019s carriers differ in service content and user experience. This is especially notable for Japanese users who want to use their Japan-bought phones (models sold locally in Japan) in China\u2014there are key points to watch for.<\/p>\n

This article will explain why China Unicom is more suitable for foreigners and foreign enterprises in China, from a slightly technical perspective, by linking the compatibility between “China\u2019s telecom technologies\/frequency bands” and “the frequency bands of Japanese phones.”<\/p>\n

Features of China’s Three Major Telecom Carriers<\/h2>\n

\"\"<\/p>\n

The development of China’s telecom network technology is based on two “modes” with different technical paths. Below is a breakdown of the differences between these two modes.<\/p>\n

TD-LTE \/ 5G NR TDD<\/h3>\n

This is the primary communication technology adopted by China Mobile, also known as Time Division Duplex (TDD) mode.<\/p>\n

Its key technical feature is that “upload and download are separated by time and share the same frequency band.” China once promoted it as a national strategy, relying on it to build the country\u2019s most extensive network infrastructure\u2014even in local areas and suburbs, its signal coverage breadth and stability are excellent.<\/p>\n

However, this mode has low penetration in Japan and Europe\/North America. Most mobile phones produced and sold in these regions do not support this mode in terms of hardware. This is the main technical reason why users bringing phones from Japan often experience unstable signals when using China Mobile SIM cards.<\/p>\n

FDD-LTE \/ 5G NR\uff08FDD\u30fbTDD\uff09<\/h3>\n

This is the main communication technology used by China Telecom and China Unicom, also called Frequency Division Duplex (FDD) mode.<\/p>\n

Its key feature is that “upload and download use separate frequency bands.” As a global standard, it is mainstream in Japan, Europe, North America and most Asian countries\u2014with its biggest advantage being strong international compatibility.<\/p>\n

Phones sold in Japan, Europe and North America are designed to support this mode, giving them great device compatibility. Domestically, its signal strength in local areas and suburbs may be slightly weaker than China Mobile\u2019s, but there\u2019s barely any difference in urban areas.<\/p>\n

Communication Standards & Bands of China’s 3 Major Carriers<\/h2>\n

For foreigners using mobile networks in China, the key is to confirm in advance if “communication standards and bands are compatible.”<\/p>\n

Notably, China and Japan have different mainstream communication methods\u2014without prior checks, your phone may have no signal or fail to connect to the internet in China.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
–<\/span><\/td>\nChina Mobile<\/span>
\n\uff08\u4e2d\u56fd\u79fb\u52a8\uff09<\/span><\/td>\n		China Telecom<\/span>
\n\uff08\u4e2d\u56fd\u7535\u4fe1\uff09<\/span><\/td>\n		China Unicom<\/span>
\n\uff08\u4e2d\u56fd\u8054\u901a\uff09<\/span><\/td>\n<\/tr>\n
Features<\/td>\n<\/tr>\n
Network Coverage<\/span><\/td>\n\u25ce
\nOutstanding coverage in local areas and suburbs<\/td>\n		\u25ce
\nRelatively stable coverage in local areas and suburbs<\/td>\n		\u25ce
\nExcellent coverage in urban areas and strong international roaming service<\/td>\n<\/tr>\n
Recommended User Groups<\/span><\/td>\n\u30fbUsers with locally purchased Chinese mobile phones
\n\u30fbUsers residing in local areas or suburbs<\/td>\n		\u30fbUsers with locally purchased Chinese mobile phones
\n\u30fbUsers prioritizing cost-effectiveness<\/td>\n		\u30fbUsers with mobile phones bought in Japan, Europe or North America
\n\u30fbForeign users living in China<\/td>\n<\/tr>\n
Communication Specifications\uff084G \/ LTE\uff09<\/td>\n<\/tr>\n
Main Modes<\/span><\/td>\nTD-LTE\uff08China’s Mainstream\uff09<\/td>\nFDD-LTE\uff08International Standards\uff09<\/td>\nFDD-LTE\uff08International Standards\uff09<\/td>\n<\/tr>\n
Main Frequency Bands\uff084G \/ LTE\uff09<\/td>\n<\/tr>\n
Band 34\uff082000MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u25b3<\/td>\n\u25b3<\/td>\n<\/tr>\n
Band 39\uff081900MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u25b3<\/td>\n\u25b3<\/td>\n<\/tr>\n
Band 40\uff082300MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u25b3<\/td>\n\u25b3<\/td>\n<\/tr>\n
Band 41\uff082500MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
Band 1\uff082100MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
Band 3\uff081800MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
Band 5\uff08850MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
Band 8\uff08900MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
Communication Specifications\uff085G\uff09<\/td>\n<\/tr>\n
Main Modes<\/span><\/td>\n5G NR TDD<\/td>\n5G NR\uff08FDD \/ TDD\uff09<\/td>\n5G NR\uff08FDD \/ TDD\uff09<\/td>\n<\/tr>\n
Main Frequency Bands\uff085G\uff09<\/td>\n<\/tr>\n
n41\uff082500MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
n78\uff083500MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
n79\uff084700MHz\uff09<\/span><\/td>\n\u3007<\/td>\n\u25b3<\/td>\n\u25b3<\/td>\n<\/tr>\n
n1\uff082100MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n
n28\uff08700MHz\uff09<\/span><\/td>\n\u25b3<\/td>\n\u3007<\/td>\n\u3007<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Most 5G connections currently use the NSA (Non-Standalone) mode, which “authenticates via a 4G network first.”<\/p>\n

In other words, even if a phone supports 5G bands (e.g., n41, n78), it cannot connect to China Mobile\u2019s network if it does not support 4G TD-LTE bands (e.g., band 39, band 40).<\/p>\n

Frequency Bands of Japanese Mobile Phones<\/h2>\n

We\u2019ve already covered the communication specifications and frequency bands of China\u2019s three major carriers, and now it\u2019s essential to address the frequency band support of “mobile phones bought in Japan (models sold locally in Japan).”<\/p>\n

For instance, when using a Japan-bought phone abroad for travel or business, you may sometimes encounter issues like “almost no signal” or “unusually slow internet speeds.” This is actually due to the “frequency bands supported by the phone itself.” The reasons behind this are twofold: first, phones sold in Japan are “optimized for Japan\u2019s local frequency bands,” and second, phones from different Japanese carriers support different frequency bands.<\/p>\n

Most recent iPhone models are compatible with global communication specifications and frequency bands, so such issues are relatively rare. However, for “Android phones purchased from Japanese carriers (carrier-customized Android models in Japan),” there are significant differences in the frequency bands they support.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
–<\/span><\/td>\nChina Mobile<\/span>
\n\uff08\u4e2d\u56fd\u79fb\u52a8\uff09<\/span><\/td>\n		China Telecom<\/span>
\n\uff08\u4e2d\u56fd\u7535\u4fe1\uff09<\/span><\/td>\n		China Unicom<\/span>
\n\uff08\u4e2d\u56fd\u8054\u901a\uff09<\/span><\/td>\n<\/tr>\n
Features<\/td>\n<\/tr>\n
Compatibility with Japanese phones<\/span><\/td>\n\u25b3
\n\uff08Many incompatible models\uff09<\/td>\n		\u3007
\n\uff08Most models compatible, few incompatible\uff09<\/td>\n		\u25ce
\n\uff08Many compatible models\uff09<\/td>\n<\/tr>\n
Main Frequency Bands\uff085G\uff09\uff084G \/ LTE\uff09<\/td>\n<\/tr>\n
iPhone\uff08iOS\uff09<\/span><\/p>\n

Band 1, 2, 3, 5, 7, 8, 12, 13, 18, 19, 20, 26, 28, 32, 39, 40, 41, 42<\/span><\/td>\n

\u3007<\/td>\n\u25ce<\/td>\n\u25ce<\/td>\n<\/tr>\n
docomo\uff08Android\uff09<\/span><\/p>\n

Band 1, 3, 19, 21, 28, 18, 26<\/span><\/td>\n

\u25b3<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
au\uff08Android\uff09<\/span><\/p>\n

Band 1, 3, 18, 26, 28, 41, 42<\/span><\/td>\n

\u25b3<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
Softbank\uff08Android\uff09<\/span><\/p>\n

Band 1, 3, 8,\u00a0 28, 11, 42<\/span><\/td>\n

\u25b3
\n\uff08Partial support\uff09<\/td>\n		\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
Rakuten Mobile\uff08Android\uff09<\/span><\/p>\n

Band 3, 18, 26, 28, 42<\/span><\/td>\n

\u00d7<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
Rakuten Mobile\uff085G\uff09<\/td>\n<\/tr>\n
iPhone\uff08iOS\uff09<\/span><\/p>\n

n1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 30, 38, 40, 41, 48, 66, 71, 77, 78, 79<\/span><\/td>\n

\u3007<\/td>\n\u25ce<\/td>\n\u25ce<\/td>\n<\/tr>\n
docomo\uff08Android\uff09<\/span><\/p>\n

n77, 78, 79, 3, 28, 257<\/span><\/td>\n

\u25b3<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
au\uff08Android\uff09<\/span><\/p>\n

n77, 78, 79, 28, 257<\/span><\/td>\n

\u25b3<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
Softbank\uff08Android\uff09<\/span><\/p>\n

n77, 78, 79, 28, 257<\/span><\/td>\n

\u25b3
\n\uff08Partial support\uff09<\/td>\n		\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n
Rakuten Mobile\uff08Android\uff09<\/span><\/p>\n

n77, 78, 28<\/span><\/td>\n

\u00d7<\/td>\n\u3007<\/td>\n\u25ce<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Globally, frequency bands used by Japanese carriers are somewhat “unique.” For instance, Band 19 (800MHz) \u2013 a key band for docomo, au, and Softbank \u2013 is barely used in China, Europe, or North America.<\/p>\n

This means many carrier-customized Japanese phones don\u2019t support overseas carriers\u2019 bands. So if you want to use such phones in China or other countries, be sure to check compatibility carefully.<\/p>\n

Why Recommend China Unicom for Foreigners in China<\/h2>\n

\"\"<\/p>\n

Many users in Japan use iPhones, and this is also true among foreign employees working in China or those staying long-term.<\/p>\n

Of course, there are also Android users, as well as short-term visitors to China for travel or business\u2014phone users here are quite diverse.<\/p>\n

China Unicom supports a wide range of international standard communication specifications and frequency bands, and this alone is reason enough to recommend it to foreigners in China.<\/p>\n

\u2460 High Compatibility with International Standards<\/h3>\n

China Unicom adopts the “FDD-LTE (4G)” communication standard, which aligns with the widely used international standards. Thus, globally compatible devices like iPhones boast high compatibility with it, ensuring reliable usage.<\/p>\n

Many foreigners now live and work in Chinese cities long-term, and in terms of communication quality within cities, there are basically no issues.<\/p>\n

Additionally, China Unicom has strong international cooperation, offering smooth roaming connections with Japan, Hong Kong (China), and other overseas regions\u2014making it a reliable choice even for those coming to China on business trips.<\/p>\n

\u2461 Reliable for Both iPhone and Android Users<\/h3>\n

iPhones are close to global universal versions and support a wide range of Chinese carriers\u2019 frequency bands. So inserting a China Unicom SIM card will rarely cause major issues\u2014calls and mobile data work smoothly.<\/p>\n

For Android phones, since China Unicom uses internationally common FDD-LTE bands like Band 1 and Band 3, most Android phones from Japan can also connect to its network.<\/p>\n

Besides, China Unicom\u2019s data plans are simple and easy to understand, with flexible adaptation for enterprises. For those mainly using phones in cities, it\u2019s definitely a cost-effective choice.<\/p>\n

Aside: Other Companies\u2019 \u201cOverseas Travel eSIMs\u201d<\/h2>\n

No Internet Connection Overseas<\/h3>\n

In recent years, \u201coverseas travel eSIMs\u201d provided by eSIM platform operators have become increasingly popular among travelers from Japan, Europe, and the United States.<\/p>\n

However, many Japanese users who have purchased these eSIMs frequently report issues such as:<\/p>\n