I change my phone, when a new phone comes with APIs that I can use.
Earlier it was K500 for Mascot Capsule API (JSR 184) and JP3, Used for more than a year.
Now its W800 for Bluetooth (JSR 82) and FileConnection API (JSR 75) and JP5, using it for last year, working fine.
Next will be some JP7 with Camera Capabilities API (JSR 234) but not from currunt line, may be I will skip JP7 for next version.