Before calling a plumber, try to unclog your drains and toilets yourself by using a plunger. Make sure you use a standard bell-shaped plunger for your sink and shower drains and a plunger with a flanged end for your toilets. If neither type can loosen the pipe blockage, put a plumber's snake to use. Ratchet the snake down the pipe to eliminate any clogs.
My landlord sent this company over to the house and the plumber came in with a hand held snake. He worked on the Drain for over an hour and could not clear it. He left and we had to call another company that used a larger industrial snake. Cleared my drain in 20 minutes. I spent the whole morning at home yesterday and did not get my problem resolved and had to take the day off of work. Such a bummer
I had sewer back up problem and called Mr. Rooter on Sunday. One George arrived at scheduled time. Explained about snaking and hydro jetting. Scheduled service for Monday noon as it was already dark. George called and came ahead of schedule at around 10.40AM. Tried Hydro-jetting as well as snaking. Removed lots and lots of roots, but still could not open up the drain. His supervisor came and located the blockage which was very close to the city sewer line. Actually, the sewer line belongs to the county and he was not able to give an accurate estimate until he calls the county office and finds out their regulations etc. But, he did mention that couple of large trees need to be cut down, need to dig down and replace the broken (not sure how it was concluded, experience may be - will give him benefit of doubt) clay pipes with PVC and the cost will easily run upwards of 10K!!