If new or unknown numbers cannot reach your OnePlus 15, calls may go straight to voicemail or never arrive at all. This problem can be confusing, especially when contacts you already saved can call you without any issues. In most cases, the cause is tied to call blocking settings, network filters, or system features that treat unknown callers differently.
Why New Numbers Cannot Call Your OnePlus 15
- Unknown callers are blocked or silenced by default.
- Spam and call filtering features are enabled.
- Carrier-level call screening is active.
- Do Not Disturb is blocking calls from unsaved numbers.
- A temporary network or SIM issue is affecting inbound calls.
Silence Unknown Callers Is Enabled
Your phone may be set to silence calls from numbers that are not saved in your contacts. When this is enabled, new callers will not hear a ring, and you may not even see a missed call notification.
This feature is designed to reduce spam, but it can also block legitimate calls. Turning it off allows new numbers to ring normally.
Open Settings, and then tap Phone.
Tap Call settings, and then find Silence unknown callers.
Toggle the switch off, and test an incoming call from a new number.
Spam and Call Blocking Is Filtering Calls
OnePlus phones include spam protection that automatically blocks or filters suspicious calls. Sometimes, real numbers are mistakenly flagged as spam.
Disabling or adjusting this setting helps ensure important calls are not blocked. You can still keep spam protection active with less aggressive filtering.
Open Settings, and then tap Phone.
Tap Spam and call blocking, and then turn off Filter spam calls.
Ask a new number to call you again.
Do Not Disturb Is Blocking Unknown Callers
Do Not Disturb can allow calls only from contacts, favorites, or repeated callers. If this mode is active, new numbers may never reach you.
Checking this setting is important, especially if you recently enabled focus or sleep features.
Open Settings, and then tap Sound and vibration.
Tap Do Not Disturb, and then check Allowed calls.
Set it to allow calls from anyone.
Carrier Call Screening Is Active
Some carriers enable call screening or call filtering services by default. These services can block calls before they even reach your phone.
If the issue continues after changing phone settings, the carrier may be the one stopping the calls. This often happens with new SIM cards or recently activated lines.
Contact your carrier, and then ask if call screening is enabled.
Request to disable call filtering, and then restart your phone.
Reseat the SIM Card
A poorly seated SIM card can cause random call issues, including problems with inbound calls from new numbers.
Reseating the SIM forces the phone to reconnect to the network and refresh its registration.
Turn off your phone, and then remove the SIM tray.
Reinsert the SIM securely, and then power the phone back on.
When new numbers cannot call your OnePlus 15, the issue is usually related to call filtering rather than a serious hardware problem. Once you review blocking, spam, and carrier settings, most users regain normal call behavior right away.
FAQs
Why can saved contacts call me but new numbers cannot?
This usually happens when unknown callers are silenced or blocked by spam protection or Do Not Disturb settings. Saved contacts bypass these filters.
Will disabling spam protection increase robocalls?
It may slightly increase spam calls, but you can reenable filtering later or block specific numbers manually if needed.
Can my carrier block calls without notifying me?
Yes. Some carriers automatically block suspected spam calls at the network level, and these calls never reach your phone.
