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Double check if you have the correct APN settings
Hi Chotiyaa,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I suggest that you first try turning the handset off and remove the SIM card for around 30 seconds, once this has been done put the SIM back in and restart the device, after this has been done automatically download the settings.
Menu > settings > More > Internet Settings > Accept disclaimer > Choose network
I hope this helps.