Help I WILL PAY - SIM CHANGER

[Yanis]

Hi! One of my application errors that " phone number doesn't match the simcard insert the phone. " I don't have that simcard and I need to log in to this app. If anyone can solve it, I will pay for it.

 

[puppykickr]

Use Wi-Fi instead.
No SIM card required.

If you get pop ups or notifications about No SIM or similar, put the device into airplane mode and then turn Wi-Fi back on.

 

[ocnbrze]

What apps is this? is there any way you can change your account info with your new number?

 

[Hadron]

The association between SIM card and phone number is in your carrier's systems, not your phone, so you cannot change that.

So what is the app actually checking: your phone number or your IMSI (SIM number)? Have you changed the SIM or phone number since you last used the app? If so, did the app developer seriously not make provision for that happening (because people do change these things)? And, as asked above, which app is this?