It might be hard for people to recognize the presence of ubiquitous sensors on their daily lives. It crawls into every aspects of our lives and we see them as normal while it was not so twenty years ago. Then again, if this technology would be were removed subtracted from their lives , the absence is sensed clearly; as Marcia Riley said: "Ubiquitous computing, or calm technology, is a paradigm shift where technology becomes virtually invisible in our lives".
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USFI correct the phone call sentence as this:The phone call is still asking the fellow in your sentence.
USFWould it be OK if I omit who and can?Not in the original sentence. The participle is OK, and so is the to-infinitive.