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Even though the 5510 was revolutionary, it technically wasn't the first phone with an MP3 player. The Siemens SL45 introduced this feature almost 4 months before, in August 2001! : r/vintagemobilephones
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Siemens SL45 Silver Gsm Unlocked Phone DISPLAY 1.50-Inches (101x80) BATTERY CAPACITY 540mAh WEIGHT 88g(3.10 oz)
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Buy Cadex 07-110-8590 | Cadex charger battery adapter. To be used with model V30145-K1310-X136-1 Li 3.6V 550 m ah battery, made for Siemens SL45, SL45i, SL42, 6688, 6686
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