Every Android phone can multitask beautifully! Are you not aware how to? Simply hold the home button down and you will see all open apps. Android was built for multi-tasking!
This is not entirely accurate. It will generally show your 8 most recent apps, whether they are currently open or not. Also, "open" is a fuzzy concept with android. The OS likes to do its own process cleanup, so it will keeps processes running in the background if it wants, and end them if it wants. This why task killers exist, but there is a great deal of controversy about their usefulness.