I want to make it clear that Unicom card can't send text messages or make phone calls.

When roaming around the world, Hong Kong, Macao and Taiwan, if you can't log in to the network normally after booting overseas, you can try the following methods: 1 Search and log in to the most suitable 3G network in the local area; If there is no 3G network available locally, the mobile phone will automatically search for the local 2G network; 3 If the mobile phone cannot search the local 2G network normally, it is necessary to force the mobile phone to only search and log in to the local 2G network: (1) Select the mobile phone menu, and then enter the following menu items; (2) Select Tools → Settings → Mobile Phone → Network → Network Mode → GSM only. Tips: 1. By default, the "network mode" option of the mobile phone is "automatic" or "dual mode", that is, the mobile phone can log in to the local 3G network or local 2G network. However, due to the 3G networks of individual operators, it may take a long time for mobile phones to search 3G networks, which will affect your normal use. If this option is changed to "GSM only", the mobile phone will only search and log in to the local 2G network, thus improving the success rate of mobile phone searching the network; 2. Different models of mobile phones have different settings. Please refer to the mobile phone manual for specific settings. 3. Some countries or regions have different network standards and frequency bands, so it is necessary to replace appropriate mobile terminals to use the international roaming function; 4. The mobile phone is set to automatically select the network, and no operator can be found to cooperate with our company. You can manually select a network by changing the setting to "Select Network Manually". If the above problems still cannot be solved, you can call the international, Hong Kong, Macao and Taiwan roaming customer service hotline+8618610010 for free service feedback (free only when you call with our mobile phone).