In case you're on the fence about whether you should drop $179-$199 on the new HTC EVO 3D, it seems that some current Sprint subscribers have been able to call customer service and receive an additional account credit of between $40-$70 in addition to the standard upgrade credit of $150.
The only hitch is that you must request this credit before upgrading your phone (those who have requested this credit afterwards have generally been unsuccessful), and receiving this credit will renew your contract for an additional two years (which shouldn’t be a deal breaker if you are planning on upgrading your phone anyway).
Many are reporting that this credit is per line, not per account, so this can add up to quite a tidy sum depending on how many lines exist on one's family account. However, drawing from the experience of those who have attempted this, only current Sprint subscribers who are at least 18 months into their current contracts, or already out of their contracts, are eligible for this credit.
Keep in mind that this is definitely a case of YMMV, as some people have been denied for reasons unknown, and others who are fewer than 18 months into their contracts have been successful at getting this.
I decided to try this out on a recent call I made to Sprint to report a local 3G outage. In the course of the conversation, I mentioned that I had heard about a loyalty credit available to current customers who renew their contracts. I was placed on a very brief hold while the representative reviewed my account, and when he came back I was informed that I was eligible for a $100 statement credit (I have two lines) if I agreed to renew my contract until June 2013. Interestingly enough, I was only about 11 months into my current contract. Again, your mileage may vary.
After being reassured multiple times that I would still be eligible to upgrade to the EVO 3D with my full discount, I agreed to the credit and promptly ordered my new phone online at full discount after I hung up.
Receiving the credit is as simple as (1) calling customer service and (2) asking for it.
If you are unsure about upgrading to the EVO 3D, perhaps this can push you in the right direction. And in any case, it never hurts to call Sprint and see if your account is eligible![xda-developers]