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Have you double checked the APN settings?
Hi Wondery,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
If this continues, you will need to get the handset back to the place of purchase, as the issue may be a result of the repair. Please use the link below.
http://support.sonymobile.com/global-en/contactUs/
I am sorry for this inconvenience.