Apple mobile phone is not a perfectly just like we needed all application which are you want to install all are only iphone software and a[pple mades all software for users its good butin this mobile phones no any exeternal storage is inserted like as I am buy ipone 4 and in this mobile space was only 16 GB then I should not another external memory was inserted and it was not for all pepoles budget to buy iphone it was very costly to lower or medium family membersand it was not easly to understood this mobile it has some other types for all other mobile phones.