2.GSM is the universal 3G mode of China Mobile Unicom.
3.WCDMA is the network mode of Unicom 3G.
4.TD-SCDMA is mobile 3G.
The customer service number 2 18 will answer your questions. Wechat payment, one-click phone bill recharge, traffic, points, bills and detailed bills can all be self-operated, convenient and fast.