Technology has affected human life. Some people think that smartphones have considerably changed people's life. However, there are others who think that television has played a more important role. In my opinion, smartphones have had more effects for two reasons.
To begin with/first of all/first, smartphones are usually used more than television, because people can have two-way connection in smartphones. Since individuals are social, they prefer to be connected with each other by smartphones instead of using TV. Therefore, people can show their emotions whenever they need. People can get feedback without any limitation. For example, it is possible for a person to contact him or her friend in the jungle using their smartphone. However, television does not have such advantages. If a person is in mountain and he or she wants to connect with someone, they cannot use TV, because it is not accessible there. Therefore, smartphones are more influential than television.
Secondly, people can have many choices when they use smartphones. There are some different applications that can make individuals able to have comfortable life, since they can do their tasks. For example, a student can search on Google about a special article and he or she finds it easily. In addition, he or she can enhance their knowledge by watching videos on YouTube. On the other hand, television has only a limited number of programs, most of which are entertaining and not educational. Imagine a student who wants to watch an educational program; he or she usually wastes their time until the program start. This is because television authorities determine when programs should be broadcast. As a result, smartphones are more likely to influence humans' life.
In conclusion, with this taken into account/considered, I believe that smartphones have caused changes in individuals' lifestyle. 
Technology has  
affected
 human life.  
Some
  people
  think
 that smartphones have  
considerably
  changed
  people
's life.  
However
, there are others who  
think
 that  
television
 has played a more  
important
 role. In my opinion, smartphones have had more effects for two reasons.
To  
begin
 with/ 
first of all
/ 
first
, smartphones are  
usually
  used
 more than  
television
,  
because
  people
 can have two-way connection in smartphones. Since individuals are social, they prefer to  
be connected
 with each other by smartphones  
instead
 of using TV.  
Therefore
,  
people
 can  
show
 their emotions whenever they need.  
People
 can  
get
 feedback without any limitation.  
For example
, it is possible for a person to contact him or her friend in the jungle using their smartphone.  
However
,  
television
 does not have such advantages. If a person is in  
mountain and
 he or she wants to connect with someone, they cannot  
use
 TV,  
because
 it is not accessible there.  
Therefore
, smartphones are more influential than television. 
Secondly
,  
people
 can have  
many
 choices when they  
use
 smartphones. There are  
some
  different
 applications that can  
make
 individuals able to have comfortable life, since they can do their tasks.  
For example
, a student can search on Google about a special  
article and
 he or she finds it  
easily
.  
In addition
, he or she can enhance their knowledge by watching videos on YouTube.  
On the other hand
,  
television
 has  
only
 a limited number of  
programs
, most of which are entertaining and not educational. Imagine a student who wants to  
watch
 an educational  
program
; he or she  
usually
 wastes their time until the  
program
  start
. This is  
because
  television
 authorities determine when  
programs
 should be broadcast.  
As a result
, smartphones are more likely to influence humans' life. 
In conclusion
, with this taken into account/considered, I believe that smartphones have caused  
changes
 in individuals' lifestyle.