It is about 4 years since I’ve got Sony Ericsson K750 mobile phone.
And it is about 2 years I use Molad 2 program for zmanim detection.
This is short description for the program:

The application maintains Hebrew (Jewish) calendar, including:

• list of coming / past holidays for a specified date customized to specified location, including DST
• sunrise, sunset, candle light, zmanim
• custom events
• sedrot for each week
• specify explicit date of changeover from a Julian to Gregorian calendar
• other custom features (highlighting, enable/disable event, etc)
• supports both keypad and touchscreen devices

Work with small screens, but a larger screen is an advantage. Distributed free of charge.
This release suits MIDP-2.0 and CLDC-1.1 compatible devices. Molad2 Legacy Release is available for older models.

Download and information here.

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jme, zmanim