AT & T 's network is faster , while Verizon 's is more reliable with phone calls . Comment: The AT & T iPhone was the top performer in data transfer rates , but it ranks lower in call performance and Bluetooth speech quality compared to some BlackBerry , HTC and Samsung phones . The Verizon iPhone had a 10 % better success rate when uploading data when sitting still .
AT & T 's network is faster , while Verizon 's is more reliable with phone calls . Comment: The Verizon iPhone had a 10 % better success rate when uploading data when sitting still .