What happens next in this paragraph?

How to call the united states from switzerland
Start with 001.
The international code for making calls from switzerland is 00. Follow this with 1, the country code for reaching the united states.
Options: (a). On most cell phones, you can use the + button instead of the international code. To reach the united states from anywhere in the world, press + 1.; (b). If you live in an area outside of the us, dial 00 instead if you live in another country or if you reside in several countries. You can call the united states from any landline in switzerland but most swiss phones have a " 00 " sound, which is replaced by swiss code.; (c). Check the country code phone book to make sure that it is specific to switzerland. To find the country code for a region, pull up a map from the internet, or take a map to your local map shop and look it up.; (d). Use a dial-up phone if you do not already have one, and dial every preset number at the beginning of the message. The phone number for switzerland is 011.;
(a).