U+ USIM usage in foreign phones

When using foreign phones with a U+ USIM, you have to remember commendations as follows: 1. U+ USIMs usually work with phones that support global LTE bands. It is advisable to use phones of 2015 manufacture or later. 2. Xiaomi, Nokia, iPhone, Samsung (international version) phones usually have no problems with U+ USIMs 3. Chinese phones work better with a KT USIM; when using a U+ USIM, calls and SMS are not available but mobile data. 4. We also found out loss of the network when U+ USIM inserted in Google Pixel phone; the similar problem is not detected with KT USIM.