There's a handful of apps that exist for phones, I use Jerboa at the moment. It's easy enough to get a feed of all subscribed communities, but subscribing is a bit of a pain every way I've tried, and most communities aren't active enough to get a good feed like you can with Reddit. Part of the problem is that most the popular instances of Lemmy are getting bombarded with traffic and availability isn't great. Just hitting subscribe doesn't always work, which is likely related to server health as many instances haven't let people log in or sign up periodically.
There's also some defederation issues, so you may need several accounts and then stich them all into one feed to truly get everything you want, but I've not attempted that.
There's also some defederation issues, so you may need several accounts and then stich them all into one feed to truly get everything you want, but I've not attempted that.