While MFi cables are cheaper than Apple cables, they still aren’t inexpensive.
If you’re shopping online and can’t see the packaging, consider emailing the provider for more information.
In a traditional retail store, simply ask to talk to the tech department or customer service.
Some MFi cables that worked with one version of iOS cease working when your iPhone updates. For this reason, try to purchase a cable manufactured recently.
Depending on your iPhone’s operating system and the cable type, this method may not work. If so, you’ll need to buy an MFi-certified cable.