Highest mobile phone call

According to Official Guinness Records,

The highest altitude at which a land based mobile phone call was successfully made is 8,848 m (29,029 ft), achieved by Rod Baber (UK) using a Motorola MOTO Z8 on the summit of Mt Everest, Nepal, at 12.52 am GMT on 21 May 2007. Rod telephoned (local time 5.37 am) a voicemail account set up by Motorola;it lasted for 1 min 48 sec and cost £2.39 ($4.72). It was able to happen, due to China building a mobile phone antenna in line of sight to the North Ridge.
Rod Haber and his team summitted via the North Col, North Face and the North East Ridge. He also holds the record for the highest text message.

For a complete list of 2007 records, please visit 2007 Guinness Records in Nepal.

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Other Nepal records that might interest you:

• Highest text message
• Fastest journey from the lowest to the highest point on Earth (Dead Sea to summit of Everest)
• Fastest time to complete the Three Poles challenge (female)
• First blind man to conquer Everest
• First solo summit of Everest