I don't know how much stuff like computers or phones use. I found this....
http://www.rapidtables.com/calc/electric/electricity-calculator.htm
You can select an appliance and it will enter the suggested watts used. Select laptop and it states 50 watt power consumption. I plug in 24 hours and my $0.07/kWh rate and it tells me $0.084 per day usage.
The electricity usage is quite a small percentage of my bill. If I recall, it is about $30 worth of my $150 bill. The largest is just fees and taxes. My bill has gone up many times. I've had a $0.07/kWh rate for 14 years that I've lived here at this house, yet my electric bill has gone up from about $50 to $90 and recently to $150 per month over the course of 14 years. It's all the fees that have gone up so unplugging things or not using things wouldn't have helped with the increase one bit.
I read someone posting about leaving an outside light on all the time but now they turn it off. A 100W lightbulb running 24/7 would cost $5/month. Figure if you have it on a daylight sensor and it turned on when it got dark out, say average of 7 pm to 7 am, it would cost half that, $2.50/month.
Heck, even the clothes dryer, we run about 2 loads a day, but not every day. Plugging in 2 loads a day 7 days a week, it only costs $12/month. It all would add up doing a lot of stuff, but it would be a real hassle not to use the stuff. There's at least 1 light on in the house all day long and 3 in the evenings when the kids are home (though they are 30W CFL rather than 100W incandescent.) 2 loads of laundry, desktop is always running, a laptop is always running, at least 1 phone at any given time charging, and usually 3 cheap tablets charging since they only get about 45 minutes worth of use per charge. 2 fans run all night long when sleeping 365/year (mine and my oldest daughter's or neither of us would be able to sleep.)