I'm having a similar issue. My son's iPhone 7 did an update and couldn't connect to the cellular network. it's a known issue with the 7 (it happened to my work phone too) so I took it to the apple store where they replaced it with another phone. Now I'm getting the error from his new phone.
Let's take a look at this. Send me a private message so I can get your account info.
I am also having the same problem with my Galaxy S7. Sprint says the phone is already unlocked. Please help. I did work for about 4 hours at first.
Howdy jtwph0672. I'll be more than happy to look into this for. I sent you PM so I can gather a smidge of info.
I have similar issue with my S10+
Sprint said it's unlocked (domestic + international)
When I insert the sim card, it says invalid
Any potential solution you may have?
I am having the same issue I called customer service and they say the phone is unlocked but, I still get a message saying invalid Sim contact sprint to unlock your phone.
Hi ActionJ. It's possible that we sent an unlock code at one point that was not received by the phone, so our system shows that an unlock request was successful and has the phone marked as unlocked. In order for the signal to come through, the phone must be powered on, connected to WiFi, and have the Sprint SIM in the phone at the time the unlock code is sent out from Sprint.
If you qualify for an unlock (details in the link below) and need help with getting a new signal sent out, drop me a PM and we can get some additional info so that we can put a new request out for you.