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
Аккумулятор для Siemens Sl45 - купить оригинал, новый
Siemens SL45i - pictures, photos and images
SL45/SL45i Modifications - Minijack audio, antenna removal, battery flashlight, car adapters and other tricks
Siemens SL45 - «VIOLITY»
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SL45/SL45i Modifications - Minijack audio, antenna removal, battery flashlight, car adapters and other tricks
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SL45/SL45i Modifications - Minijack audio, antenna removal, battery flashlight, car adapters and other tricks