Gmail client for mobile devices was released by Google a month ago. It's Java ME MIDP2 application, cool looking as one could expect from Google. I went and installed it last week on my Motorola V3X.
Well, I found out that while Gmail for mobile work on hundreds of different mobile devices, it doesn't work on mine. I've got weird error message "Sorry, the Gmail mobile app will not work on your phone. Your phone doesn't have the appropriate certificate to communicate with Gmail. Try accessing Gmail on your mobile browser at http://m.gmail.com". It sucks.
Apparently my phone lacks that Verisign Class 3 public certificate. Apparently that's known problem and on some phones it can be solved by adding that certificate available from Verisign. Alas, it seems to be impossible to add another root certificate to Motorola V3X phone - I was trying every single way - via Motorola Phone Tools, Bluetooth obex, P2K drivers - nothing helps. Even if I put new certificate into /a/mobile/certs/root/x509/kjava/ folder the phone still won't recognize it. Motodev support didn't help - "Can I help you? What is Gmail for mobile? Give me URL. It clearly says Download Gmail for the Motorola V3 RAZR (US/Canada). You are from Israel. Issue closed." Well, I still hope someone would solve this problem for Motorola phones too.