The local number (or subscriber number) must always be dialed in its entirety. The first few digits in the local number typically indicate smaller geographical areas or individualtelephone exchanges. In mobile networks they may indicate a network provider in case the area code does not. Callers from a number with a given area/country code usually do not need to (but optionally may) include the particular area/country code in the number dialed,which enables shorter "dial strings" to be used. Devices that dial phone numbers automatically can include the full number with area and access codes,since there is no additional annoyance related to dialing extra digits.