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Poor Reception iPhone 4s

Journeyman

Poor Reception iPhone 4s

Sprint can you please help me with this - I am at my home and I have done a "Field Test" with my iPhone 4s to show my lack a signal - I have attached screen shots of said tests. My Zip Code is 54603 the cross streets are Rose Street & Sill Street - My phone always resorts to the Palace Street Tower with the same zip code of 54603.

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My understanding is that 40 dBm is optimal for making phone calls. My worst test has been -103 dBm