VTech review: SOS Pendant Model SN7022

I purchased the SOS pendenant for my 90yr old mother-in-law. She has falling and been unable to reach phone to call for help. I thought I had found the perfect answer with this pendant since I already had the Vtech phone. When I got it and set it up I was testing the service to see how it works and was unable to connect the call when it rang my phone. Call technical support and was told it was my phone and carrier. The other three emergency contacts were not able to connect to call either. That means 4 different smart phones and two different carriers don't aork. We all have newer smart phones and I'm with Verizon and the other is Sprint. Told them I wanted to return pendant and was giving adrees but told I had to pay for shipping.