Spain does not have an area code 346. Spain is telephone country code +34, and a number beginning with +34 6 is a mobile phone, with 8 further digits to make up the full number. Within Spain, just dial the 9-digit number (in this case, beginning with 6); otherwise, dial the full international number by prefixing country code +34 to the 9-digit Spanish number.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
+34 is Spain.
The country code and area code of Apulco, Mexico is 52, (01)346.
The country code and area code of Maarssen, Netherlands is 31, (0)346.
The country code and area code of Falkenberg, Sweden is 46, (0)346.
The country code and area code of Sivas, Turkey is 90, (0)346.
The country code and area code of Colonia Rapettti, Uruguay is 598, (0)346.
Yes, 713 is an area code for Houston, Texas, USA, along with area codes 281 and 832, and future area code 346.
The country code and area code of Khanty-Mansiysky region, Russian Federation is 7, (8)346.
As of 2014, Houston has four telephone area codes: 713, 281, 832, and 346.
The country code and area code of Turkmenabat, Turkmenistan is 993, (8)428.
Cypress, Texas, uses area codes 713, 281, and 832, the same as greater Houston. Area code 346 will be added as a further overlay in 2014.
Yes, but it doesn't go into service until July 1, 2014.