There are a few worth getting support for early: Coinbase Wallet, and Trust Wallet being two of the most useful. While Coinbase’s process is straightforward, we’ve contacts there and they’ll surely implement once it makes sense, given sustained traction.
For Trust Wallet, it’s a matter of implementing support for the HSD client into their Wallet Core: https://github.com/TrustWallet/wallet-core
We should likely prioritize this and discuss it next dev call. If anyone else can suggest others, please let us know.