回答
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Nowadays people can just hold their smartphone over the automatic ticket checker as they go through the gate.
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The automatic turnstile can read your smartphone if you hold your phone over it as you go through.
1) Nowadays people can just hold their smartphone over the automatic ticket checker as they go through the gate.
「近頃は自動改札を通る時ににスマホをかざすだけでよい。」
2) The automatic turnstile can read your smartphone if you hold your phone over it as you go through.
「自動改札にスマホをかざせば、自動改札がスマホを読んでくれる。」＝「スマホをかざすだけで通れる」
「自動改札」は
automatic ticket checker
automatic ticket gate
automatic turnstile
などと言います。
「（改札を）通る」は
go through
「…をかざす」は
hold ... over
ご参考になれば幸いです！
日本 
