@rillamyrilla256: I don't see any problem on that. As long that [403-Area code] it has still available, those Ph#s. As far as I know the 403 is the oldest Area-code, from Alberta.
As comparison BC has (2-Area codes) Telus, usually ask costumers if they wanto have (604 or 778-Area code) Normally older Area-codes it's been assigned to landlines. Contact Telus to find out. Bye "v9"
Lots of the 'old' area codes are becoming vanity numbers. Often businesses who wish to be seen as being in the location historically related to the area code will pay a premium to get the area code they want. Vancouver businesses want 604 not 778, Toronto business want 416, and so on. There is apparently a big business in grabbing these numbers and reselling them.
If you are moving to a small community, where all the numbers of a particular prefix are not consumed, you may easily be assigned a 403 area code; if a larger centre, there may well be a waiting list for 403 numbers. BC now has 4 area codes. All you can do is ask!