With the different functions that today's cell phones feature, the use of this becomes very much integral. For one, cell phone is necessary because this provides ease of communication. Through the use of this device, people can easily communicate with each other wherever they are.
In detail, the professionals use cell phones because this do not allow them to communicate with ease but as well navigate the internet without the use of a computer. The use of cell phone also becomes necessary to the elderly as this maintains their contact to their distant loved ones as well as enhances their safety through its emergency response system feature.
Not becoming... always were.
Smart phones are an innovation to regular cell phones and can be a lot more fun because of all the free apps. Although the apps are not always a necessity.
Most to all cell phones today will have sms capabilities. Short message capabilities are almost a necessity now with about 70 percent of the population carrying cell phones.
I think that land Lines are still a necessity until cell phones have been perfected. Not all cell phones are equipped with GPS locators and that can raise complications in emergency situations when detecting a location is crucial to survival.
The possessive form of the noun necessity is necessity's.
The plural of necessity is necessities.
Twitter is not a necessity.
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I presume you mean: 'Was the development of cell phones a neccessity?' Very little in life is a neccessity, but it seems reasonable to suppose that normal human curiosity would seek to combine the technologies of telephone and radio.