win8.1 行動網絡問題

我剛買左部win8.1 tablet,有 3G,我想問點樣可以手動揀NETWORK OPERATOR,因為我搵極都搵唔到,因為用CMHK,要轉個佢去PCCW先行到 3G,依家只係行到 2.5G,請問有冇師兄知道邊 SET?

我係google search左

To change network selection settings

1. Swipe in from the right edge of the screen, tap Settings, then tap Change PC settings.
(If you're using a mouse, point to the top-right corner of the screen, move the mouse pointer down, click Settings, then click Change PC settings.)

2.Tap or click Network, then tap or click the name of your mobile broadband network.

3.Tap or click Scan.

4.To have Windows automatically choose a network, select Automatically select (recommended). Or, to choose a network yourself, select the network name from the list, then tap or click Register.