Why can't I get 4g on my HTC One S mobile any longer?

[AC Question]

Earlier i enjoyed 4g services in my htc one s mobile.

But now i coudn"t get even 3g for net browsing with my htc.why this happens. Is there any software for upgrading my htc one s t-mobile phone

 

[belodion]

If you've got no mobile data connection, try toggling Mobile Data, and also Airplane Mode.
Perhaps also your SIM is faulty. Your carrier or network will be able to help.

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