I looked at British website for obtaining ETA. Seems like you need cell phone to apply. If I don't have a cell phone , can I use friend's cell phone to input information required to obtain ETA? Is the ETA approval linked to my passport and not the cell phone I would use? I will not have the cell phone with me. Thanks.
You don't need a cellphone. You can access the website on any device. The ETA is linked to your passport.
https://apply-for-an-eta.homeoffice.gov.uk/apply/electronic-travel-authorisation/how-to-apply
Frank is correct. I'm planning on apply for it in the next few days and will use my laptop. It looks very easy.
You asked this question an hour ago already. Perhaps you thought it didn’t post?
https://community.ricksteves.com/travel-forum/england/how-to-get-eta-for-england-and-netherlands-without-having-a-cell-phone