Change default tel. number in templates to "0812345678" instead of "+66..."

In Thailnand we are all use only 08.. option, in ads, on contact pages, numbers of incoming calls - always 08.., not +66
Some users may not understand, what is "+66..."
Also, if user do not change default tel. number in template after completing web site, it's reasonably to just remove the cell with tel. number from the template (his web site)