IPhone 3GS not implemented the HSUPA protocol). It was released in the United States, Canada, and six European countries on June 19, 2009, in Australia and Japan on June 26, and internationally in July and August 2009. The iPhone 3GS runs Apple's iOS operating system. It was succeeded as Apple's flagship smartphone in 2010 by the iPhone 4; however, the 3GS continued in production until September 2012 when the iPhone 5 was announced. The iPhone 3GS was made available for pre-order on June 7, 2009 and released on June 19 in the United States, Canada, and 7 European countries, and on June
IPhone 4S announced, it was considered by some media to be a disappointment, due to the expected release of an iPhone 5. There were no external differences between the iPhone 4 CDMA model and the , with the exception of a SIM card slot on the . All changes were internal (slight external differences between the iPhone 4 GSM model and the exist, as said differences existed between the CDMA and GSM models of the iPhone 4). On September 10, 2013, the iPhone 4S name was re-stylised as iPhone 4s, using a lower case 's' to reflect the names of the newly