Formatting international phone numbers

Phone numbers (strings ‘from’ and ‘to’) should be formatted in international format with country code without any prefixes (such as ‘00’ or ‘+’) or spaces ‘ ’, numbers only.

Some information we feel will be useful for you:
—  What is the message length?
—  Can I send and receive messages with Unicode?
—  I do not receive messages sometimes
—  Sent messages are not delivered sometimes
—  Formatting international phone numbers
—  Sender ID
—  Spam