Making calls on speaker-phone is the most annoying use of mobile phones, according to research on Kiwi travellers' phone habits.
Travel organisations Expedia and Egencia have studied mobile device behaviours and preferences among travellers.
Nearly 60 per cent of New Zealand travellers said their smartphones were very important or critical to their daily lives and 23 per cent said they used their smartphones more when they were travelling than when they were at home.
Kiwi travellers placed a strong importance on phone etiquette in public places, the study revealed.
Almost two thirds of New Zealanders found people making calls on speaker-phone in a public place an offensive behaviour.