Zte -G R221 User Manual page 36

Go to Settings→Select SIM to select a SIM card which you wish to use to
connect to the internet.
Go to Settings→Profiles to select a profile or add a new one.
Go to Settings→Browser options. Select Timeout to set timeout. If the
timeout period elapsed prior to completion of the operation or the server is
not responding, it will show "Connection Failed". During the timeout
period, it will keep trying to connect until expired. Select Show images
to set whether or not to show the images. Select whether or not to
enable Cache and Cookies.
Go to Settings→Service message settings to set the service message
receiving.
Go to Settings→Clear cache to clear cache.
Go to Settings→Clear cookies to clear cookies.
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