I've seen inexpensive charger cables that don't clearly explain their USB-C capabilities. How can I verify that a cable actually supports data transfer, rather than only charging? I'd also like to figure out whether a failed connection is caused by the cable, the phone, or compatibility between the devices. What specifications or testing methods should I look for?
2 Answers
The safest approach is to buy cables from a reputable manufacturer and check the listed USB standard, such as USB 2.0, USB 3.x, or USB4. USB-C only describes the connector shape; it doesn’t guarantee a particular data speed. To test one, connect the phone to a computer and see whether the phone offers a file-transfer or MTP option. Try the same phone and computer with a cable known to work, then test the questionable cable with another compatible device. That helps identify whether the problem is the cable or the phone.
A USB cable tester can check continuity and sometimes identify which conductors are connected, which is useful for spotting charge-only or damaged cables. However, a basic tester usually can’t prove the cable reaches its advertised speed or that it is safe for every charging setup. Battery health is mainly determined by the phone and charger’s charging controls, not just whether the cable passes a continuity test. Look for clearly stated power ratings and data speeds, and avoid cables with vague or missing specifications.
So a continuity test can show whether the wires are connected, but I’d still need to test actual file transfers and check the cable’s power and speed ratings separately?