Smartphones. Advantages and disadvantages.

Almost everyone has a smartphone in their/his*** pocket or handbag. I would say that the all people have one. And every day, we all do more and more things with them. We spend a lot of time with our smartphone in our hands, maybe we are wasting our time. But, certainly, all of us want to own one of these devices. And if it is possible, the most modern one, because this will have many advantages.

The first advantage is that you can speak with another person immediately. If you want to say something to someone, you only ring and speak to him or her. But this was the main purpose of the mobile phone in the past. Today, there are many other things you can do with a smartphone. Secondly, you can text using different applications, like Whatsapp, Line, and others. Furthermore, you can use it as a GPS device, with maps of the whole world and find every place, cinemas, restaurants, shops, and thing like this, in order to go to your destination easily. Thirdly, it is possible to receive warning messages from the police, fire departament, and others like this, in order to be warned about emergencies. In addition, there are a lot more things that you can do with a smartphone, such as taking photographs and videos.

On the other hand, there are also some disadvantages. For instance, children usually waste a lot of time using it. They don't speak to their friends face to face, because it is extremelly easy texting to communicate with others. Another is that, acording some researches, people handle their smartphones  more than one hundred times every day. If someone forgets his/ their smartphone, they/he would be extremelly worried, and would look for the way to find it as soon as possible.

To sum up, and from my point of view, nowadays, a smartphone is completely neccesary to live, but I will have to care of it, because I depend on it a lot and losing it would be a big problem.

*** las reglas en esta situación cambian de persona a persona, y no sé las reglas oficiales.

Pero, "someone, somebody, anyone, anybody" llevaba la forma masculina singular. Asi que "someone lost his money" (o her money, su tú sables que la persona es un mujer/niña)  pero en realidad casi siempre en inglés hablado, escucharás "someone lost their money"

Smartphones. Advantages and disadvantages.

Almost everyone has a smartphone in their pocket or handbag these days. I would say that the whole people  entire population have has one. And every day, we all make do more and more things with them. We spend a lot of time with our smartphone in our hands, maybe we waste our time. But, certainly, all and sundry want to own one of these devices. And if it is possible, the most modern one, because this it have has many advantages.

The first advantage is that you can speak with another person immediately. If you want to say something to someone, you only need to ring and speak to him or her. But this was the main propouse about purpose of the mobile phone in the past. Today, this is the less least important thing that you can make do with your smartphone. Secondly, you can text by using different applications, like Whatsapp, Line, and others. Furthermore, you can use it as a GPS device, with maps of the whole world, and find every any place, cinemas, restaurants, shops, and things like this, in order to go get to easily. Thirdly, it is possible to receive warning messages from the police, fire departament, and others like this, in order to warn about emergencies. Although, there are a lot more things that you can do with smartphone, such as taking photographs and videos.

On the other hand, there are also some disadvantages. For instance, children usually waste a lot of time using it. They don't speak to their friends face to face, because it texting is extremely easy texting to communicate with others. Another is that, according to some researches, people handle their smartphone more than one hundred times every day. If someone forgot their smartphone, they would be extremely worried, and would look for the a way to catch get it back as soon as possible.

To sum up, and from my point of view, nowadays, smartphones are completely neccesary to live, but <em>I will have to care of it, in order to they don't manage our lives.</em>

In the final sentence you start with "I" (first person singular) but finish with "our" (plural). There are a couple of ways to rewrite this:

I will have to take care, in order to make sure they don't manage my life.

We will have to take care, in order to make sure they don't manage our lives.

I will have to be careful, in order that they don't manage my life.
We will have to be careful, in order that they don't manage our lives.

<em>(The text in red is interchangeable in each sentence, it's just two ways to say the same thing).</em>

Great stuff Fer! My corrections are in red and suggestions to sound more natural are in blue/grey.

While "researches" is not wrong, "research" can be used as a plural. If you want to stress that it's more than one, you could say "some research studies".