iPhone only drops calls with other cellphones not landlines
Why would an iPhone drop calls only with cell phones but not landlines?
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Please contact your Carrier.
Call Failed or Dropped Calls
In telecommunications, the dropped-call / Call-Failed rate (DCR) is the fraction of the telephone calls which, due to technical reasons, were cut off before the speaking parties had finished their conversational tone and before one of them had hung up (dropped calls or Call Failed). This fraction is usually measured as a percentage of all calls.
5 Reasons Your Phone Keeps Dropping Calls or encounter Call Failed.
- Your Signal Is Weak.
- It's Raining (Cats & Dog)
- The Cell Tower Is Overloaded / Heavy Traffic (Telecommunication)
- You've Misunderstood Your Signal Strength
- You are moving and the signal weakens while changing from one tower to another