Ubiquitous gadget of the contemporary age, cellphones/mobile phones are obviously something that people refer to a lot during their day-to-day lives. Sometimes we love them, sometimes we hate them, but we certainly can’t live without them anymore :)
In Portugal, we call them [o] telemóvel, a portmanteau of [o] telefone (telephone) and móvel* (mobile, capable of moving or being moved from place to place), which unsurprisingly yields mobile phone.
In Brazil, the preferred term is [o] celular, short for [o] telefone celular, just like cellphone is short for cellular phone. While the words are wildly different, they do make some sense inside their internal logic – and since both have cognates in English, it shouldn’t be too hard for you to pick them apart!
* As a noun, [o] móvel means “piece of furniture”; [os] móveis in the plural mean furniture (in general).
In Portugal, we use the borrowing [o] smartphone (pronounced similarly to English – well, as similarly as our own linguistic rhythms allow) to refer to the newest touchscreen phones; in any case, [o] telemóvel is still the word you should use when you’re making a reference to the devices in general, with [o] smartphone being used only when you want to say something specific about smartphones (or when you want to highlight that aspect of the cellphone), for example: