I know this is old, but in case anyone is reading this Ting has a new $100 credit offer:
https://ting.com/?promo=zr17bn3r6aaWith the recent addition of a GSM network Ting is raising its free credit offer.
From now until 11:59pm ET on June 8, the Ting Refer a Friend program is offering you $100 to try Ting mobile phone service. If you sign up and activate a phone, I’ll also receive a $50 credit and yes, once you join Ting, you’ll be able to refer your friends too.
zr17bn3r6aa.ting.com. That’s my unique referral URL and the key to this offer. Click through and you’ll receive $100 off select phones in the Ting shop or a $100 credit if you bring your own phone to Ting.
Speaking of which, the phone you already own will probably work with Ting. I recently moved my iPhone 6 to Ting’s GSM network from Verizon and I like it.