As you're developing or customizing uMobile, you'll want to test regularly to make sure your app is functioning as expected. The processes and requirements for testing on iOS and Android are very different.
Testing iOS (iPhone and iPad)
As mentioned before, you can only develop and test iOS applications on Mac OSX 10.6.7 (Snow Leopard) or greater. Here are the additional requirements for testing and releasing iOS apps (including testing on a device).
- An iOS Developer Program Account ($99/year)
- XCode with iOS SDK: http://developer.apple.com/xcode/
- A Development Certificate to sign applications for testing on devices
- A Development Provisioning Profile to install on devices for testing
- A Distribution Certificate to sign applications for distribution in the App Store
- A Distribution Provisioning Profile for submission/distribution through App Store
Setting up iOS Developer Program Account
Visit http://developer.apple.com/programs/ios/ and click "enroll now". During the process, you can select if you'd like to enroll as a company or as an individual. Enrolling as a company will generally make more sense as it allows multiple users to be associated with one account, but it will likely take a few days for Apple to verify information about the company and approve the account. If you enroll as a company, you won't be required to pay the $99 fee until your account has been approved. Individuals should be prepared to pay the fee at the end of the signup process.
Once your account is created, you'll have access to two important tools for iOS development and deployment: iOS Provisioning Portal and iTunes Connect.
Setting up XCode and iOS SDK
Although most of the development time for uMobile takes place in your own code editor and Titanium Developer, you'll need the iOS SDK to compile apps and will need XCode occasionally to manage other data. You'll need to be enrolled in the iOS developer program (or Mac OSX Developer Program) before you can download XCode. Visit https://developer.apple.com/xcode/ to download the IDE bundled with the iOS SDK. The download is about 4.6 Gigs, so be prepared to wait a while. Once XCode finishes downloading, install it, and you now have the iOS SDK ready to go.
Creating iOS Certificates and Provisioning Profiles
The creation and management of certificates and provisioning profiles can be confusing, but is a necessary part of the process to be able to test on real devices and ultimately submit your app to the App Store. A simple way to think about certificates and profiles is that a certificate pertains to the integrity of one or many applications, whereas a profile pertains to the deployment context (eg. Device, App Store Distribution, Ad-Hoc) of one or many applications. Here are some examples of profiles:
- Jeff Cross Development Certificate - Personal certificate for signing apps to test.
- Unicon, Inc. Distribution Certificate - iOS Account-wide certificate for signing apps for distribution
- Team Provisioning Profile - A shared profile for all users under the same iOS Developer Program account.
- Jeff Cross iPad Profile - A profile for a specific device.
- Sakai11 Distribution Profile - A profile used for packaging an app for distribution
For now, you can just worry about settings up a development certificate and development profiles, but eventually you'll need to create a distribution certificate, and separate distribution profiles for each app you want to distribute.
The process for managing certificates and profiles is covered in good detail here: [http://developer.apple.com/library/ios/#documentation/Xcode/Conceptual/iphone_development/128-Managing_Devices_and_Digital_Identities/devices_and_identities.html|http://developer.apple.com/library/ios/#documentation/Xcode/Conceptual/iphone_development/128-Managing_Devices_and_Digital_Identities/devices_and_identities.html]. Follow the steps outlined there to set up your team for iOS development.
Testing in iOS Simulator
Assuming you've already set up your project in Titanium Developer, you just need to open Titanium Developer, select your project on the left, click the "Test and Package" tab, click the "Run Emulator" tab, select iPhone (default), and then click the Launch button. 
The iOS Simulator should open quickly with your app running.
Testing on iOS Device
Packaging iOS For Distribution
Testing Android
Android Testing Tools
DDMS
ADB