My cellphone is Nokia E63,i have been using for years.It has good cost performance,and even can be used a a weapon: if a thief sneak into your house and at that moment you don't have a weapon to defend yourself,then throw it  to the the thief.the thief could be passed out but the Nokia would still be fine.

Huawei C8812E and Motorala XT720

i have two phones . i phone 5 + blackberry z10

I have an iPhone. Before I got my iPhone, I found checking dictionary while reading to be very distracting. But now if there are some words I don’t understand, I can simply tap on the words to quickly bring up their definitions from the built-in dictionary or Wikipedia. It is so convenient that now I only read e-books on an App called iBook. You can also tap on the texts to high light the words whose definition you have just checked, that way it will help you identify these words the second time you read these pages. Besides iBook, there are many, many Apps designed for English learners. You get tons of grammar exercises, e-books and audiobooks, and they are either free or cost very little. One more reason that makes iPhone an indispensable learning tool is its podcasts. A podcast is a pre-recorded, digital quality audio/video broadcast for iPhone/iPod. The topics of podcasts range from politics, science, education, comedy, life, music, news and more; you get podcasts for ESL learners and you can even download university videos/audio courses through something called iTunesU (‘U’ stands for university). Yes, all of the subscription is for free and requires almost no effort to download. Your computer updates podcasts continuously and automatically, that way, when you are charging your iPhone, it is also at same time getting the podcasts you have subscribed from your computer.

One bad thing about using iPhone is that it is a closed system. Users have little freedom in terms of how he wants to use its hardware and software. If you want to have more control over your iPhone, you will have to heck it. Another bad thing about iPhone is its battery life which has already been mentioned.