What is a good thesis for a research paper regarding cell phones?I'm very interested about cell phones and would like to write my research paper...

In terms of writing a term paper on cell phones, the
thesis would depend upon specifically what you plan to write
about.

In terms of your introduction and thesis
statement:

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Indicate your
topic. When you write an introduction, you need
to clearly indicate the topic (i.e., the subject matter) that you will be writing about.
Be careful that you do not confuse your topic with your thesis. For example, if you are
writing an essay that argues for renewable energy, you will need to briefly explain or
define renewable energy because that is your
topic.

In deciding upon the
specifics you will include, you mention that you will write about history of the cell
phone: will you also include the advancements of cell phones most recently, and what
extended services and perks are included with new cell phones and related services? Or
expectations of the future of cell phones?

Will you include
possible dangers of using cell phones, especially concerns of driving and texting and/or
talking while driving, or concerns about potential brain
cancer?

Depending upon the extent of your research, your
thesis statement would vary. If you are only going to include the history of cell
phones, you might write:

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The heavy, bulky portable devices of the past
have given way to amazing little computers that do more than allow one to talk on the
phone. (I try not to use "phone" more than once.)

The
development of cell phones has changed the face of the world, how people communicate,
and obtain
information.

Another spin on
a broader topic might look like this:

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While cell phone have advanced in amazing ways
since their inception, there are many concerns about their safe
use.

Hope these suggestions
provide you with some options and/or ideas.