If you see a number you don't recognize in your recents, it's me.
If you see a number you don't know on your phone, that was me.
この場合、次のような言い方ができます。
ーIf you see a number you don't recognize in your recents, it's me.
「履歴に知らない番号があれば、私です」
in one's recents で「履歴に」
ーIf you see a number you don't know on your phone, that was me.
「電話に知らない番号があれば、それは私です」
on one's phone「電話(の履歴)に」
ご参考まで!
If you see a unknown phone number in your call log, it's most likely my phone number.
ご質問ありがとうございます。
この場合、「履歴が[あったら](https://eikaiwa.dmm.com/uknow/questions/75970/)自分の(電話)です」と言いたいなら、英語で「If you see a unknown phone number in your call log, it's most likely my phone number.」と言えます。
ご参考になれば幸いです。