Before you go out and buy a brand new iPhone because your 6, 6s or 7 is being slow, there may be a cheaper solution. Apple has now admitted that iOS 10.2.1 enables older iPhones to be slowed down. The cheaper option to get your phone working better is to simply replace the battery. A Barclays' analyst thinks Apple's sales will go down once users realize this. "Especially in conjunction with Apple’s 11 month ‘plea bargain’ to reduce the price of battery replacements from $79 to $29." Even if you don't notice your phone slowing down, a $29 battery replacement is a sweet deal!