3 easiest relay🔀 software on PORTABLE device using android (+ termux cli tech knowledge)

👉 citrine-universal-v0.4.3.apk 
👉 pip install nostr-relay
👉 nostr-relay-tray-1.6.0.AppImage 

client + relay🔀  lead to HIGH DATA BANDWIDTH usage n hefty bill if mobile is not cheap
disk space needed too.
portability during traveling is biggest ADVANTAGE