recommand flexiroam, buy data plan as esim - if phone not support, buy real sim to utilize esim, different country different plan, choose what your need. In China, esim support google email.
-wangyangyi(wangyangyi);
6-10(#6111109@60)
my ref link for some free data
-wangyangyi(wangyangyi);
6-10(#6111110@60)