Quick answer: Mobile players experience varied network. Bashes that simulate low-bandwidth (3G, throttled WiFi) surface bandwidth-sensitive bugs.
Mobile networks aren't fast. Test like they are.
Use a network throttle
Simulate 3G, throttled WiFi. Real conditions.
Or test on slow physical network
Move to a slow cellular area. Real environment.
Audit data usage
Per-session data; growth rate. Players notice.
Optimize per-network
Different graphics quality per detected network. Auto-tune.
“Mobile is bandwidth-constrained. Plan for it.”
If you ship mobile multiplayer, the network simulation testing is mandatory.