3G, 4G and 5G: what the difference means for travellers
What affects you is not the number but what your plan and the local network support.
Author: eSIMonline Technical Review · Technical reviewerPublished: September 5, 2026Last updated: September 5, 2026
Quick answer
- For ordinary use 4G is enough in almost every case; 5G helps with speed where both the network and the plan support it.
- Check which generations the plan states it supports, since some roaming agreements exclude 5G.
The generation number describes the technology, not the speed you will get. Real speed depends on how many users share the cell, distance from the mast, and the priority roaming users receive, which is why 5G in a crowd can be slower than 4G in an empty street.
The short version
| Generation | Good for | Traveller's note |
|---|---|---|
| 3G | Messaging, maps and basic web | Many countries are retiring it, so check the destination's situation |
| 4G | General use, video and video calls | In practice the widest available to roaming users |
| 5G | Large files and heavy uploads | Needs the device, the plan and the local network to support it |
If a plan says it supports 5G but you only ever see 4G, that may simply mean 5G is not open to roaming users there. It is not a fault in the plan.
Is 5G worth paying more for?
- For maps, messaging and video, 4G is enough in almost every case
- For frequent large uploads, 5G helps noticeably where it is actually available
- 5G uses more battery, so allow for charging if it stays on all day
FAQ
Can I force the phone to 4G only?+
On most phones, through the cellular settings. Locking to 4G sometimes gives a steadier connection and better battery where 5G coverage is patchy.
Why is 5G sometimes slow?+
Because speed depends on how many users share the capacity and on roaming priority, not on the icon displayed.