The Ericsson R310s is a rugged, water-resistant mobile phone released in the early 2000s. Below are its key specifications and a summary of customer reviews.

Specifications:

• Design: Shock-resistant, rubberized casing with a distinctive "shark fin" antenna.
• Water Resistance: Rated IP57 (dustproof and can withstand brief submersion).
• Display: Monochrome LCD screen.
• Battery: Long-lasting NiMH battery with extended standby/talk time.
• Network: GSM 900/1800 MHz.
• Features: SMS, WAP browser, alarm clock, calculator, and games.
• Weight & Size: Compact but sturdy build (approx. 170g).

Summary of Customer Reviews:

• Durability: Highly praised for its ruggedness, surviving drops, water exposure, and harsh conditions.
• Battery Life: Considered excellent for its time, lasting days on a single charge.
• Signal Reception: Strong performance even in weak coverage areas due to its shark-fin antenna.
• Design Quirks: Some found the rubberized casing bulky, but others appreciated its grip.
• Basic Features: Limited by today's standards (no camera, basic WAP browsing), but reliable for calls/texts.
• Nostalgia: Often remembered fondly as a tough, no-nonsense phone from the early mobile era.

The R310s was well-regarded for its resilience and reliability, making it a favorite among outdoor enthusiasts and workers in demanding environments.