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Phone Numbers: (309) 503-XXXX
Recently Searched Numbers in the 309 Area Code
About the (309) 503 Prefix
The (309) 503 prefix serves Peoria, Illinois, United States. Phone numbers in this exchange follow the format (309) 503-XXXX. The primary carrier assigned to this prefix is T-Mobile.
(309) 503 Geographic Info
- Primary City
- Peoria
- State
- Illinois, United States
- Primary Carrier
- T-Mobile
Other Prefixes in the 309 Area Code
Most people don't think about phone security until something goes wrong. A little knowledge goes a long way:
The FTC received over 4.5 million complaints about unwanted calls in 2024, and the real volume is far higher — most people never report the calls they ignore. Robocallers now use automated systems that can blast millions of calls per day at nearly zero cost.
Read more: How to Stop Spam Calls on iPhone and Android (2026 Guide) →Frequently Asked Questions
What area code is (309) 503?
(309) 503 is a telephone prefix in the 309 area code, which serves Peoria, Illinois, United States.
Where is the (309) 503 prefix located?
Phone numbers with the (309) 503 prefix are located in Peoria, Illinois, United States. The primary carrier for this prefix is T-Mobile.
What carrier uses the (309) 503 prefix?
The primary carrier assigned to the (309) 503 prefix is T-Mobile. However, numbers may be ported to other carriers over time.
How do I look up a phone number with the (309) 503 prefix?
Enter the full 10-digit number (e.g. (309) 503-XXXX) into ClarityCheck's reverse phone lookup to instantly see the owner's name, address, social profiles, and more.