Opening Spiel: 

1. No concern mentioned 

Hi,  This is Errol from T-Mobile. How may I help you? 

2. Basic inquiry 
Hi,  This is Errol from T-Mobile. I'm happy to help take care of …. for you. 

3. cx (customer) with concern 
Hi,  This is Errol from T-Mobile. I'm here to help. Let's partner together to get this resolved. 

Closing Spiel: 
Awesome! So happy we were able to help. Have a great rest of your day. 

Here in T-Mobile we're glad to assist you regarding your - We hope our service and work brought a smile to your face and made your life just a little easier. So happy we were able to help. Have a great rest of your day! 

ASSUMPTIVE CLOSING (middle of convo before providing reso):  

While I am working on your account, do you perhaps have any other concerns related to your plan, bill, promotion, or network to ensure we can make your day better?