A Google developer who works on Android said recently that he's unsure if the G1 will be able to handle further updates.

"As much as I'm hoping that it'll be possible to somehow continue updating the G1, I can't promise anything," Jean-Baptiste Queru, a software engineer at Google, wrote on Twitter. "We knew that internal flash space was going to be very tight on the G1 and we kept the system partition tight on purpose," he also wrote.

G1 users got the so-called Cupcake update to the operating system earlier this year. Google is reportedly working on further updates to the software, including a version known as Donut. It has not published information beyond the first-quarter update on the Android .

T-Mobile denies that the G1 will be unable to accept future updates. "We plan to continue working with Google to introduce future software updates to the T-Mobile G1. Reports to the contrary are inaccurate," it said in a statement.

But some observers if T-Mobile will continue offering certain updates, like security patches and bug fixes, but not more substantial updates.