The answer to this question is for my orthodox readers. The answer is - yes, you can and you even must.
Today, (ultra)orthodox Jews do not use technology to gather on Shabbat. This is horrible and incorrect interpretation of the Torah. Please read my Shabbat article for detailed argumentation.
Every Shabbat in (ultra)orthodox community is like Yom Kippur. It is a day of mourning and silence. Streets of religious neighbourhoods in Jerusalem and New York are empty and look like a ghost town. This is unacceptable !!!
This is what Torah says about the Shabbat:
YLT Lv 23:3 six days is work done, and in the seventh day is a sabbath of rest, a holy convocation; ye do no work; it is a sabbath to Jehovah in all your dwellings.
As you can see, Torah says that it is a HOLY MEETING. Therefore, we are to do everything we can to gather together on Shabbat, especially in our time, when we do not have the Tabernacle. We must use cars and phones and internet and other technology to get together on Shabbat. Why impostor rabbis prohibited us what Torah clearly allows and commands?
So, do not listen to rabbis and use technology on Shabbat without any fear!!!
Driving your family to the beach, even if you work as a taxi driver, is NOT SLAVE WORK!!! Calling your grandma is NOT SLAVE WORK!!! So please enjoy life and technology, which God gave you to be comfortable on your day of rest!!!