Sony 12640775, ST21a2, ST21i2 manual Selecting networks for data traffic, Mobile network settings

To control the data usage of individual applications

1 From your Home screen, tap .

2Find and tap Settings > Data usage.

3Select a SIM card.

4Find and tap the desired application.

5Make the necessary adjustments to change the data usage limit, restrict background data, or restrict all data traffic for the application.

6To access more specific settings for the application, tap View app settings and make the desired changes.

Specific settings for an application may not always be accessible.

The performance of individual applications may be affected if you change the related data usage settings.

Selecting networks for data traffic

You can use data traffic on both SIM cards in the phone, or select to only use data traffic on one of the SIM cards. You can also set the phone to switch between the SIM cards automatically, for example at certain hours.

You can configure the data network from the setup guide the first time you start your dual-SIM phone.

To select your preferred data network

1 From the Home screen, tap .

2Find and tap Settings > Dual SIM card > SIM card for data traffic.

3Select a SIM card.

For faster data transmission speeds, select a SIM card that supports 3G.

To enable or disable automatic switching of data traffic between SIM cards

1 From the Home screen, tap .

2Find and tap Settings > Dual SIM card.

3Under Auto switch, mark or unmark the checkbox beside Data traffic.

To set a data traffic period for your dual-SIM phone

1 From the Home screen, tap .

2Find and tap Settings > Dual SIM card.

3Under Auto switch, tap Data traffic.

4Set the data traffic period for different SIM cards as required.

You can only set a data traffic period when both SIM cards are enabled in your phone.

Mobile network settings

Your phone automatically switches between mobile networks depending on what mobile networks are available in different areas. You can also manually set your phone to access a particular mobile network type, for example, WCDMA or GSM.

To select a network type

1 From your Home screen, tap .

2Find and tap Settings > More… > Mobile networks.

3Tap Select SIM card, then select a SIM card.

4Tap Network Mode.

5Select a network type.

Your phone supports the concurrent use of one WCDMA network and one GSM network, or two GSM networks.

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