I was reading this article https://www.coindesk.com/jonas-schnelli-wants-run-bitcoin-full-node/

In it Jonas Schnelli talks about running full nodes on smartphones.

I realize you could create a similar gateway script for other SPV wallets. For example you run a full node on your phone with a gateway, and then point your Breadwallet/Greenaddress/Samuraiwallet software to connect only to your own full node via gateway. This would be good in situations where people want to use those wallet UIs.

edit: Also these gateways can have private transaction broadcasting over tor built-in.