Whanganui Spark and Vodafone customers have no local service centre with both companies closing their Victoria Avenue stores, citing earthquake safety concerns.
Customers arriving at the stores on Monday faced closed doors and signs saying the business was temporarily closed.
Spark senior communications partner Ellie Cross says Spark is "absolutely committed" to retaining a shop in Whanganui, either by returning to the current premises at 65 Victoria Ave when remedial work is complete or by opening at a new location.
"In the meantime, staff are being redeployed where possible or being assigned work that can be completed remotely," Ms Cross said.
The telecommunications company was looking at whether it could open temporary premises in Whanganui "preferably in the next few weeks".