Switching carriers or using a different SIM card on your iPhone doesn’t have to be complicated. If your device is SIM-locked, ...

To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

If you also want to call without a SIM network and data, then try this trick. If you have an Oppo or OnePlus smartphone, then you can do this work very easily. For this, you just have to unlock ...