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 Is it feasible for a nostr app to become a simple relay in the phone? i.e. just help out with propagation of notes and then delete after shortly thereafter. 
 Edited:

Is it feasible for a nostr app to become a simple relay in the phone? i.e. just help out with propagation of notes and then delete shortly thereafter. 
 I don't think so, unless we're talking about a Nostr oriented VPN, because you would need an IP that can be reached by other clients. 
Or a protocol like Holepunch's Hypercore.  
 IPv6 which the advanced countries are now using on their cell networks gives every phone a public IP.  
 IPv6 suuuuuuuuuuucks 🖕🖕🖕 
 YYYYYYYYYEEEEEEEEEEEEESSSSSSSSSSSSSSSSSSSSS it does it does it does it does omfg it fkn does X.X

127.0.0.1 is home.
::1is cancer e.e

nostr:note1gd7kalkjf6wsqwehhtzzj4lweukf052dt25ru8af3xrf4yjl2r0snxxqnl  
 What problem do you have with it?  What ISP or VPN? 
 Administering it 🤢 
 Clearnet IPv6 is a whole lot simpler than IP4 IMO.  Right off the bat, there is no NAT nonsense.   The only annoyance I've had is that too many devices (like network enabled printers) only support /64 subnets.

The IPv6 mesh is even simpler.  The only thing you might configure are some remote peers (LAN peers are automatic). 
 Big Tech will never fully support IPv6 - IPv4 forces consumers to use centralized services.

I recommend IPv6 mesh VPNs like Cjdns, Yggdrasil, Pinecone.  Every device gets a permanent cryptographically authenticated IPv6 that is also mobile.   A SIP client can use the raw IP in the contact list - no need for telco, DNS, or TLS.

Where IPv6 is supported, the mobile IPv6 protocol (easily self hosted) lets an IPv6 on your net be anywhere that support clearnet (normie) IPv6. 
 Neat, i should look into it more. Probably won't get adopted until painfully late , like https.  
 Interesting. I was always under the impression it was the other way around. That linking a public IP directly to a device was potentially a privacy problem and that it was more private to access the Internet through a NAT. 
 Ok forget it I didn't read the whole thing 
 For clearnet IPv6, that could be an issue.  But just as with IPv4 - use a VPN if you want to obscure your IP.  The Linux IP6 stack will listen on a stable IP, but make outgoing connections on a random one that changes periodically.   So at least that obscures which machine on the LAN is making to connection. 
 Got it thanks 
 Don’t use inferior solutions
¯\_(ツ)_/¯