Your shopping cart is empty right now, but it does’t have to be!
Most signal errors have something to do with your SIM card or network coverage.
Make sure the SIM Card is inseted correctly, In OnePlus One if you're not getting a signal at all, make sure your card facing the bottom of the OnePlus One. While NanoSIM to MicroSIM adaptors usually work, some adapters may get stuck in the SIM slot or cause damage to the motherboard. We recommend that you get a new MicroSIM card for your OnePlus one – they are usually free or very inexpensive from your mobile operator.
If you're connected, while 2G and 3G networks are usually available, LTE connectivity can often be weaker depending on your area. Make sure that your SIM card's contacts are clean, and if you're using an adapter, it must not move around once placed on the SIM tray.
Confirm APN settings with your network provider to avoid no network/low network issues.