the simplest (NOTE THE DOTS!!!):
match: +x. (with dot, dot means any repeat of x ([0-n] times), x is any character) - this will match any phone mumber starting with +.
remove: +
add: 000
These patterns are part of VoIP dialplan standard, not our invention.
BTW: x. will match any phone number. this could be useful for e.g. always adding 9 before the number.
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You could be more precise, e.g.
match: +32x. - something that starts with +32
match: +32xxxxxxxxxx - something that starts with +32 followed by 10 digits
But the syntax allows much more complex matches.
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Testing:
To see what is the outcome of the processing, click the contacts number (as ususal) and the call confirmation action sheet will show the final number (processed).
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I made the topic sticky. If you have questions / examples to share about the Dial Plan we can continue this topic here.
Based/inspired by on industry practice e.g.:
http://en.wikipedia.org/wiki/Telephone_numbering_plan