Location: San Ramon, CA

Circuitcastle Technologies aims to provide you with a one-stop shop for pre-owned or new, high-end smartphones at a great price for yourself or your loved ones!
All Smartphones sold by us are checked for full functionality. Carrier Service/data plan needed for voice call and/or mobile data are not included with the product. The buyer has to purchase them at his/her own risk/responsibility.
Each and every phone is inspected for IMEI/ESN and listed only when the IMEI/ESN is found clean. We do not sell any smartphones with bad or blacklisted IMEI/ESN.
All pre-owned smartphones are inspected and graded according to their cosmetic condition to meet Swappa's requirements for Mint, Good and Fair category. All phones sold by us are fully functional. There are no hidden labels or comments for any functional defects. So you can shop worry free from us!
The Phones sold on this website are guaranteed not to be under any contract and the phones listed as GSM Unlocked will work with majority of the GSM carriers worldwide. The phones sold by us does not come with any warranty including but not limited to water proof feature advertised by manufacturer.
Your satisfaction is our priority. We provide hassle-free returns. Buyer can return the product within 15 days of receiving it, if he/she is dissatisfied for any reason with the product. The device has to be packed and shipped back in its original packaging and in the exact same condition as received in order to be eligible for return.
All smartphones come with Free Shipping and Free Returns within United States unless otherwise specified. We do not sell or ship internationally.

Popular Listings


Only 1 left


Apple iPhone 8 (Verizon) [A1863]

64 GB

iPhone 8 64GB Silver Mint Verizon/GSM Unlocked phone || 15 Days Free Returns


Only 1 left


LG G6 (Sprint) [LS993]

32 GB

LG G6 32GB Black 7/10 Sprint phone || 15 Days Free Returns


Only 1 left


LG G6 (AT&T) [H871]

32 GB

LG G6 32GB Silver 8/10 AT&T phone with screen protector and used Poetic case || Actual Pics

Latest Ratings
  • Rating Summary  1276   30   0
  • +1 rating by Allen L. on Sep 15, 2019:

    As has been the case with each purchase from this seller, an amazing customer experience!

  • +1 rating by Julie W. on Sep 13, 2019:

    Accurate description. Thank you!

  • +1 rating by L.Luna on Sep 12, 2019:

    Thank you for the phone!

  • +1 rating by None on Sep 12, 2019:

    Arrived on time and in same condition as described

  • +1 rating by Steve H. on Sep 12, 2019:

    The GalaxyS9 was received in pristine condition. I wasn't expecting it to look as good as it does.
    Thanks for the prompt, professional service!
    Thank You,

Shipping Policies

The device ships free of cost by USPS First Class Mail. There are no additional handling fees. Shipping can be upgraded to USPS Priority mail( 2 to 3 business days to reach) for an extra charge of $5 by requesting us on sale page once the device is purchased.

Return & Refund Policies

Hassle Free Returns accepted within 15 days if the buyer is dissatisfied with the purchase for any reason. We pay return shipping cost. Device needs to be returned in exact same condition as received and has to be free from passwords/ Google account locks/ Apple ID locks in order to be eligible for return. If the device is returned in broken/damaged or non functional condition including but not limited to water damage it will not be eligible for returns.