If you are signing up for Ting you can get a $25 discount using this referral link.
This is their refer a friend program that lets you get a $25 discount which can be applied toward a new device. If you already have a device, the credit will go to your account and you’ll save $25 off your bill.
I just bought an iPhone 4s from Ting’s online store. I actually had trouble finding a referral link, but I did make a new friend and got a sweet $25 off.
Here is a description of the phone from the Ting device page:
Apple iPhone 4s
The iPhone 4s is powerful, beautiful and dependable. With an excellent camera, capable processor and retina display, this stainless steel superstar is still a prominent device.
Description
If you’re looking for an effortless smartphone experience that packs a punch, look no further than the feature-filled iPhone 4s.
Your best friend Siri can set your alarm, read your messages, take notes and schedule appointments. 3D maps, AirPlay video mirroring and Turn-by-Turn navigation are just a few of the latest updates you get access to with iOS 7.
Its powerful dual-core A5 processor and revamped 8 megapixel camera makes this a solid device for any smartphone enthusiast. With a panorama mode, 1080p video recording, live camera filters and more, the 4s is perfect for any photo junkie not looking to break the bank.
Ting Referral 
Thank you for the link! Worked great for me. ^_^
Check out my review of Ting here: http://savewithting.blogspot.com/ I talk about strategies that can help you save even more money on Ting!
Offer friends and family an incredible $100 off a phone or as Ting credit. Get $50 in Ting credit for yourself for every single successful referral in this time too. This offer only runs until 11:59pm ET on June 8, 2015. There has never been a better time to refer a friend to Ting.
https://zt6f204pota.ting.com/
I am using ting from past 6 months, it really saved my money and time.Their customer service is excellent and responsive. Hope they remain the same.
If you want to save some money use my referral link to get $25 and further.
https://zhjt8886l3q.ting.com/