Announced in 2001, the Siemens S45 was Siemens's

Siemens AG

Siemens AG is a German multinational conglomerate company headquartered in Munich, Germany. It is the largest Europe-based electronics and electrical engineering company....

 first ever GPRS

General Packet Radio Service

General packet radio service is a packet oriented mobile data service on the 2G and 3G cellular communication system's global system for mobile communications . GPRS was originally standardized by European Telecommunications Standards Institute in response to the earlier CDPD and i-mode...

 mobile phone, allowing for faster data transmission and Internet access with the coupled dual-band GSM-900 and GSM-1800 networks. http://www.siemens.com/page/1,3771,260638-1-999_0_0-168,00.html

The phone came with 360 KB of internal memory, which was considered generous at the time. This storage space was marketed as flexible because it could be manipulated like a hard disk via a supplied phone-to-serial cable, and the included software ensured that files could be transferred from the computer desktop to the phone in the drag-and-drop manner. http://asia.cnet.com/reviews/handphones/0,39001718,20001801p,00.htm

Later, Siemens released the S45i, with added E-mail client

E-mail client

An email client, email reader, or more formally mail user agent , is a computer program used to manage a user's email.The term can refer to any system capable of accessing the user's email mailbox, regardless of it being a mail user agent, a relaying server, or a human typing on a terminal...

.