The BenQ-Siemens EF91 is a 3G-enabled mobile phone released in the mid-2000s. Below are its key specifications and a summary of customer reviews:

Specifications:

• Network: UMTS (3G), GSM (Quad-band)
• Display: 2.0-inch TFT, 262K colors, 176 x 220 pixels
• Camera: 2.0 MP rear camera with autofocus and LED flash
• Memory: 20 MB internal storage, expandable via microSD (up to 1 GB)
• Connectivity: Bluetooth, USB, EDGE
• Battery: 820 mAh removable Li-Ion (up to 4 hours talk time)
• Dimensions: 94 x 51 x 19 mm, 110 g
• Features: MP3 player, video recording, speakerphone, Java support

Summary of Customer Reviews:

• Pros:

  • Good build quality with a sleek, compact design.
  • Decent 2 MP camera for its time, with autofocus and flash.
  • Reliable call quality and 3G connectivity.
  • Expandable storage via microSD.

• Cons:

  • Battery life was considered short, especially with heavy usage.
  • Limited internal storage (only 20 MB).
  • Some users reported sluggish performance with multimedia features.
  • No Wi-Fi support, which was a drawback compared to competitors.

Overall, the BenQ-Siemens EF91 was seen as a mid-range phone with solid basics but lacked some advanced features expected in later models.