Transcript for Could inexpensive chargers put your iPhone at risk?
Back now with "Gma investigates." We spend so much time on our phone, one of our biggest concerns making sure that they are charged. But could some of those inexpensive cables actually put your iPhone at risk? Every year millions of counterfeits are seized and destroyed. Gio Benitez has more. You know, what these are, these are lightning cables and seem to be available everywhere. Gas station, drugstores and when you're running on low battery you might just grab what's convenient to charge four phone but many don't realize in some cases that could end up doing serious damage to your phone so this morning "Gma investigates." We've seen the reports and home videos of when iPhones catch fire. The room was smoky. Terrifying to me. Reporter: But what keeps your iPhone safe? There's a little protective chip inside apple approved lightning cables that guards your iPhone from a power surge for potentially overheating but experts say many cables on the market don't have that chip. Apple has a certification program called made for iPhone or mfi. Cords from other manufacturers have to include that protective chip. Fake cables can and do kill iPhones. How do you know what's an mfi certified cable? We bought eight, three from gas station, one from a popular discount store, one from CVS, one from Walmart and two from Amazon. We take them to Jessa Jones where she sees damaged phones from customers using unsafe cables almost daily. You could be lucky your entire life but that one time that a noisy voltage goes up and damages the inside of your phone, your phone may just be totally dead. Reporter: He opens our cables to see what's inside. That's a really important chip. Reporter: The cables from Walmart and CVS from the proper protective chip but our cable from the discount store is a different story. It says on the box it works with certain iPhones and it doesn't claim to be mfi certified. You shouldn't use it. Reporter: And it doesn't have that chip and the cables we bought from three different gas stations all under 8 buck, the first two are missing that important protective chip and the third -- everything sort of looks legit. Maybe you guys got the deal of a lifetime. Reporter: But Jessa says it's a counterfeit. We did not get a good deal. No. Reporter: Our last two were sold on Amazon and claimed to be mfi certified on the listing and packaging. But when she checks for the chips. This is definitely not a certified cable so that is in direct con tros to what we're being told by the advertising. Reporter: Jessa finds six out of the eight cables we bought did not have the protective chip and could pose a hazard. Thousand that our expert has taken a look at these cables we'll send them off to apple to see what the company has to say. Apple did confirm to "Gma investigates" that those six cables were counterfeit or otherwise problematic and could damage your phone and the safety of our customers is our first priority and all apple and apple certified products conform to high quality. We reached out to all the stores and only received comment from Amazon and said customers trust they will receive authentic goods and anything that diminishes that trust is unacceptable. Ul, one of the largest safety labs say consumers who use them without those safety features are taking a chance. You could potentially overcharge the battery which could cause a fire or explosion which is definitely a problem. As for those products on Amazon we checked and they're no longer listed and while Jessa and others say you could be fortunate and never have a problem, still, they say, it's best to just play it safe. So we see the cables are counterfeit. The labels that make it look like they're not are counterfeit. How can you tell? Just go to an apple store. You can go to the apple website. They have a list, a database of all mfi certified products. If it costs 4 bucks, it's probably not legit. I like ray good deal, though, gio. It's going to cost you more when you have to replace this. Always looking for that deal. Always a pleasure, gio.
This transcript has been automatically generated and may not be 100% accurate.