Yes, telephone number change cost is 700 AMD.

Call to number 115 in Yerevan: Please dial 115 short number, and enter your six-digit telephone number following the instructions of the answering machine, after which the information on your debt amount will be presented to you via voice message.
Call to number 115 in regions of Armenia: Please dial 115 short number, and enter your eight-digit telephone number following the instructions of the answering machine, i.e. the regional code + the telephone number, without dialing 0, after which the information on your debt amount will be presented to you via voice message.
The information concerning your debt is presented in 3 languages - Armenian, Russian, and English.
Calls to 115 short number from a landline telephone number are free of charge.
The service is provided free of charge when calling from Team mobile telephone numbers.
The subscribers can receive information concerning their debt amount for landline telephone communication services for the previous month as of the 3-rd day of each month.