Twitter isn't just for computer users. You can access Twitter from your iOS, Android, or other mobile device with Internet access. If you don't have a smartphone, you can even text Tweets from any cellphone with SMS capabilities. All you need to know is the right Twitter access point.
Here's a list of the places where Twitter is available to you.
|Mobile phone with Internet access (such as an iPhone or Android phone)
|Mobile phone with texting capability
|40404 (United States)