IPhone 5S Hong Kong, and Singapore. It was released in 25 additional countries on October 25, 2013, and in 12 countries on November 1, 2013. Indonesia was the last country to receive the iPhone 5S, on January 26, 2014. On September 19, 2014, the iPhone 5S was succeeded as Apple's flagship smartphone by the iPhone 6 and iPhone 6 Plus, but the older model remained available for purchase at a reduced price, while the 64GB version was discontinued. The gold edition of the iPhone 5S was discontinued on September 9, 2015, when Apple revealed the iPhone 6S and iPhone 6S Plus The
IPhone on the O2 network in the United Kingdom, however, can buy the phone online and activate it via iTunes as with the previous model. Even where not required, vendors usually offer activation for the buyer's convenience. In the US, Apple has begun to offer free shipping on both the iPhone 3G and the iPhone 3GS (when available), reversing the in-store activation requirement. Best Buy and Walmart will also sell the iPhone. The iPhone's operating system is designed to only run software that has an Apple-approved cryptographic signature. This restriction can be overcome by "jailbreaking" the phone, which involves replacing the