Samsung is prepared to employ a more aggressive tactic in order to convince those who've not yet returned their Galaxy Note7 smartphone that they should do so soon. The company says about 85% of all Note7s sold in the U.S. have been safely returned, but 15% have not. "To further drive participation [in the Note7 Refund and Exchange Program], we will be releasing a software update in the coming days that will limit the phone's ability to charge beyond 60%, as well as issue a reminder pop-up notification every time a consumer charges, reboots, or turns on the screen of their Note7 device," said the company. Samsung says Note7 owners who still have their device should power it down immediately and bring it to the point of sale for a refund or exchange as soon as possible. Samsung ceased manufacturing the Note7 and issued a global recall for the phone after some of the devices overheated and sparked fires.