YouTube error · Common
YouTube not loading on mobile data — fix the cellular-only failure
YouTube works on Wi-Fi but fails on mobile data — slow loading, buffering at the lowest quality, "video unavailable" errors that disappear on Wi-Fi. Cellular-specific failure.
Why this happens
- Mobile carrier is throttling YouTube traffic (most US prepaid plans cap video at 480p or below).
- Cellular DNS is broken for googlevideo.com.
- Low Power Mode / Data Saver is on, restricting background fetches.
- You have YouTube's "Data saver" enabled in account settings.
- Roaming / international SIM with bad routes to YouTube CDN.
How to fix it
- 1
Test your actual carrier speed
Open speedtest.net on cellular. If your speed is fine for general use but YouTube stutters, the carrier is specifically throttling video. Common on T-Mobile prepaid, Boost, Cricket, Visible, etc.
- 2
Disable Data Saver / Low Power Mode
iOS: Settings → Cellular → Data Saver → off. Settings → Battery → Low Power Mode → off. Android: Settings → Network → Data Saver → off. Each reduces video quality automatically when active.
- 3
Disable YouTube's Data Saver
YouTube app: profile → Settings → Data saving → "Data saver mode" → off. Browser: youtube.com/account → playback → "Save data" preference → off.
- 4
Switch DNS
Use Cloudflare 1.1.1.1 mobile app or change DNS in iOS/Android network settings. Some carrier DNS routes return slow YouTube CDN edges.
- 5
Download on Wi-Fi for cellular playback
If your carrier throttles video, download videos on Wi-Fi to your device, then play offline on cellular without streaming.