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Steps to reproduce:
1. Open mobile sample "MWC" iOS sample".
2. Debug or run the sample.
3. click on Twitter
Actual Result: it is showing "Twitter not available. Try again later" on all iOS devices and Simulators.
Expected Result: Twitter logging page should displayed after clicking on Twitter.
Application Output: https://gist.github.com/saurabh360/09578271e986bf21960a
iOS Device log: https://gist.github.com/saurabh360/4bb35b65e6c88ab2cafa
X.S 4.1.9(build 6)
All physical devices and All Simulators
Xcode 4.5 and Xcode 4.6
MobileSample-master/MWC iOS sample
Same behavior happening with stable iOS 188.8.131.52, we are not sure it has worked before on previous build or not.
2013-08-29 17:52:33.719 MWCiOS[313:5007] ERROR saving downloaded XML: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Net.WebException: The remote server returned an error: (410) Gone.
^ (410) Gone
Looks like the app is using an old deprecated API* to access Twitter. You should remove this feature from your test plan or ask the author(s) if they want to update the sample (so it stays a good application reference for customers).
* According to  this v1 API was removed in March 5th, 2013 - so it likely never worked since then.
Could you take a look at the twitter functionality of "MWS" iOS sample and update it accordingly or assign this bug to the right person. Please refer Comment #1 for further details regarding the bug.
Update twitter functionality. Fix commits for this bug: adf1c90dcfa4d0b469279e8511b30e348b2c086e - e0e32bbac9efaa4a981936269e081ae04cfc5a25
Now for mobile sample "MWC" iOS sample" , twitter opens correctly on iOS device and simulator. Screencast: http://screencast.com/t/fiJ5UPIuV
iPhone 4 (iOS 7.04)
Version 4.2.3 (build 154)
Release ID: 402030154
Git revision: 4dca4a28d7ecc2c4df8a4d58e74b8902d0283b53
Xamarin addins: cc120a6f639fa6649aa4d23a0f0e7c5701134047
Sample Git version