Question: I've just started editing my novel. 

For the drafting I had done most of the work on a phone, as I wanted to make the most of the daily commute. This worked well enough and the first rough draft is done. 

However, I'm finding the same approach just isn't as strong for editing as it's not easy to highlight and remove words or find things quickly on a phone. 

Does a portable computer exist that would be up to the task? A tiny laptop could work but I currently commute by bus (not train) so there isn't exactly a table or other surface I could rest a computer on. 

My other option is just working weekends, but I'd rather avoid this if possible. 

Can any writers recommend any suitable tools?

If not, how did you keep productive during the editing stage?

Answer: 
Typing on a laptop on your lap on a bus is always going to be difficult no matter what you buy. But maybe you don’t need a laptop:

I find it really helps if I edit my work in a completely different format to the one I wrote it in. If the work looks completely different I’m less likely to be blinded by the familiarity of my own words.

I read somewhere that when you look at your MS on a computer in a neat font, it gives the impression that the work is perfect and it’s harder to see problems when it already looks polished.

So, what I do is change the font to something really gritty, like American Typewriter and print it out.

I use editing marks for changes (these are easy to learn from any good editing book like the Wiley Style Manual) and then transfer them from paper to laptop later.

It may seem like a waste of time to use paper and have to transfer the edits, but what you end up with is actually a third draft, because you naturally edit/reword again as you implement those changes.

If you don’t have a printer or feel it’s too much to print out, you could invest in a tablet and a stylus. I edit like this sometimes too with an iPad and a Jot Touch. But you still need to transfer the edits to the computer later.

It will be difficult on a bus, but I think reading your work aloud is essential. It is only through reading aloud that you can isolate difficult to read sentences/paragraphs and really get a feel for your voice and the musicality of your words. Maybe you could sit at the back where it’s quiet and whisper it to yourself!!

Good luck!
For the hardware aspect of the question, you may try a tablet. So you'll get a wider surface to edit your text, without the need of a table. Mouse and keyboard will still missing, but at least, editing should be easier. But you may prefer a tiny laptop on your knees.

For the software part, I suggest [LiteWrite](https://litewrite.net). Beautiful on desktop as well as on phone, tiny, no distraction, data ubiquity, it let you choose your cloud provider (GoogledDrive, DropBox or [RemoteStorage](https://remotestorage.io)). For a long work, I recommend you to split your text in many documents with a clever naming convention, so you could rely on the search ability of LiteWrite to quickly switch between parts.

If no solution suits you, remember you can always use pen and paper, and type your work at home. Print your draft, edit it with pen on the go. Well, it may not be more comfortable. A [clipboard folder](https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Doffice-products&field-keywords=Clipboard%20folder) on your knees may help.