the first modern smartphone came out in 2007.
when did the first modern smartphone come out?
2007
bullet::::- smartphones, which combine mobile phones with the features of personal digital assistants and portable media players, first emerged in the 1990s but did not become very popular until late in the 2000s. smartphones are rich in features and often have high resolution touchscreens and web browsers. the first modern smartphone was the iphone. it was released on june 29, 2007 in the united states, and in the united kingdom, france, germany, portugal, the republic of ireland and austria in november 2007. it was the first smartphone to not include a physical keyboard, solely utilizing a touch screen and a home button.
2000s (decade)
this power model technique was developed by collaboration between l. zhang, b. tiwana, z. qian, z. wang, r.p. dick, z.mao from university of michigan and l. yang from google inc. to accurately estimate power estimation online for smartphones. powerbooter is an automated power model that uses built-in battery voltage sensors and behavior of battery during discharge to monitor power consumption of total system. this method doesn’t require any especial external measurement equipment. powertutor is also a power measurement tool that uses powerbooter generated data for online power estimation. there is always a limitation in smartphone technology battery life span that hw and sw designers need to overcome. software designers don’t always have the best knowledge of power consumption to design better power optimized applications therefore end users always blame the battery lifespan. therefore, there is a need for a tool that has the capability to measure power consumption on smartphones that software designers could use to monitor their applications in real-time. researchers have developed specific power management models for specific portable embedded systems and it takes a huge effort to reuse those models for a vast variety of modern smartphone technology. so the solution to this problem is powerbooter model that can estimate real-time power consumption for individual smartphone subsystems such as cpu, lcd, gps, audio, wi-fi and cell phone communication components. along with powerbooter model an on-line powertutor utility can use the generated data to determine the subsystem level power consumption. the model and powertutor utility can be used across different platforms and smartphone technologies.
run-time estimation of system and sub-system level power consumption