I am guessing your TV is NOT a smart TV? (If it is you can probably connect it to your router)
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Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
You can with a google chromecast, costs about £30 and is plugged into a HDMi port on the telly. You then need the chromecast app on your phone to send the content to the chromecast/telly.