Can you install youtrip into 2 devices since I have two phones?

Yes you can.

A similar scenario is my friend wanted to borrow my youtrip card overseas as his youtrip card was expected to arrive only after he returned. So i lent him my card and told him to login to my youtrip account to do the topup to the youtrip card.

So whenever he needed to top up the youtrip card while overseas, he would whatsapp me first, did the login on his phone and when i received the OTP, i would whatsapp him the OTP then he was able to login to my account on his phone overseas.

You can read more about my reviews and feedback of Youtrip here http://justbeingernest.blogspot.com/2018/11/You...

Hi! I've actually just tried it. The thing is upon set up of the Youtrip app on your second phone, there would be a 6 digit PIN sent to your registered phone number. You need to activate that by keying in; so just make sure you are able to receive this pin by having your first phone ready next to you! Also note that access on your first phone would be logged out upon successful login on second phone.

At any one time, only one device can access Youtrip app.