Checking iPhone Call Reception Sensitivity

Checking iPhone Call Reception Sensitivity  

When a new building is constructed and people move in, there are times when call reception inside the building isn't very good. People often say, "the signal isn't strong." It's important to check whether the issue lies with your mobile device or if the building has poor signal strength.

In this post, we'll summarize how to check call reception sensitivity on an iPhone. To be specific, this refers to the strength of LTE call or data reception, technically referred to as RSRP (Reference Signals Received Power).

How to check RSRP on an iPhone:

1. Open the phone app and enter 3001#12345# on the keypad, then press the call button. (For Android phones, enter *123456#.) : This number may vary depending on the country

 

2. In the next screen, select the "Rach Attempt" menu under the LTE section. (This is based on the iPhone interface.)

 

RACH (Random Access Channel) is a communication channel used by mobile or wireless devices to access mobile networks (TDMA/FDMA and CDMA).

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3. Check the reception strength labeled as "rsrp." 

 

RSRP is displayed as a negative number—the closer to 0, the stronger the signal strength. 

 

• 0 to -70 dBm: Good
• -70 to -90 dBm: Average
• -100 dBm or lower: Poor reception

 

By comparing your phone’s RSRP value with other people's phones in the same location, if your phone shows lower values, it may be necessary to visit an authorized service center. However, if others (with the same carrier and similar model) have the same issue, then it’s likely a reception problem with the building itself.

 

In such cases, you should contact the mobile carrier and request an investigation, stating that the signal inside the building is poor. The carrier’s engineers will visit to identify the cause of the issue and may resolve it by installing additional repeaters or other measures.