Jay Slater, 19, went missing yesterday morning. His phone then died around 8:50am, with his last known location registered in the 'Rural de Teno' park
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Jay's family are now scared for his life and have launched a desperate rescue effort.
The last known location registered by his phone appeared to place the teenager close to the PR-TF51 hiking trail, several hundred feet above the small village of Masca in southern Tenerife.
But there have been no reported sightings of the teen from hikers.
Speaking to the Manchester Evening News about Jay's disappearance, a scared Lucy said: 'He's gone on a night out, he's gone to a friend's house, someone that he has met on holiday.
'One of the people he has met has hired a car out of here, so he's driven them back to his apartment and Jay has gone there not realising how far away it is.
'He's ended up out in the middle of nowhere. Jay was obviously thinking he would be able to get home from there.
'But then in the morning he's set off walking, using his Maps on his phone and ended up in the middle of mountains with nothing around.
'He rang me at about 8 o'clock in the morning saying his phone was on 1 per cent, he said ''I don't know where I am, I need a drink and my phone is about to die''.'
Temperatures in South Tenerife peaked at 26 degrees C yesterday.