Which aspect of early cell phone technology made the first cell phones quite expensive? a. the limitations of the mobile telephone switching office b. the inability of early phones to convert voice signals c. the limited number of cell phone frequencies d. the frequent interference from radios and air traffic control

The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network.

While the transmission of speech by radio has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent. The first such devices were barely portable compared to today's compact hand-held devices, and their use was clumsy.

Along with the process of developing a more portable technology, and a better interconnections system, drastic changes have taken place in both the networking of wireless communication and the prevalence of its use, with smartphones becoming common globally and a growing proportion of Internet access now done via mobile broadband.

The letter C was correct on my work sheet paper

identify the subordinate clause in each of the following sentences. tell whether each clause is used as an adjective, an adverb, or a noun.

11.) emily dickinson, who was born in 1830in amherst, massachusetts, was a great american poet.

12.) she appeared to lead a fairly normal life until she became a recluse in her family's home.

13.) there she wrote poems that literary critics now call "great american poetry".

14.) unfortunately, only a few of dickinson's poems were published while she was alive.

15.) after she died in 1886, her other poems were published.

16.) i think everyone should reaad at least some of dickonson's poetry.

17.) dickinson is a poet whose work i now read often.

18.) the poems i have just finished reading are "a narrow fellow in the grass" and "apparently with no surprise"

19.) the rythyms of dickonson's poems are best appreciated when you read the poems aloud.

20.) whatever i read by emily dickonson surprises amd inspires me.

he believed if we do not fight back the britins would be in every household