As the Phonesat website now states
Our orbital analysis indicates that the PhoneSats have deorbited on April 27 and have burned up in Earth's atmosphere as predicted. No one has been able to hear from the satellites since, which confirms the predictions.Must say I really enjoyed chasing these, getting some decent results with very modest equipment.
The PhoneSat team is continuing to develop the PhoneSats using consumer technology to greatly increase the capability of the satellite whilst developing with a low cost - our next versions are launching late this year so stay tuned.
Thank you again for your support in making this technology demonstration successful!
In the inhibitable words of Dr. Eldon Tyrell