The following reading were recorded on 13 BlackBerry mobile phone. Some of them (columns marked with *) were Blackberry phone with correct Blackberry data plan, while some of them were simple non blackberry phones (like- Nokia 6600, explicitly shown) with GPRS connectivity. One of them were even lacking the GPRS connectivity. I studied the data connectivity with an intention to record the behaviour of RIM’s BlackBerry API in low or no data connectivity conditions.
The BlackBerry devices used of the study includes- BlackBerry 9000 (Bold), BlackBerry 8320 (Curve), BlackBerry 8110 (Pearl), BlackBerry 8800, BlackBerry 8300 (Curve) etc. The BlackBerry JDE used was 4.3.
Row number 1 and 2 (Carrier? And MDS?) represents values returned by CoverageInfo.getCoverageStatus().
All “True +ve” shown above are real Data Connection Refused cases. Below is a cut down version of the above table with only the required data. Two of “True +ve” are matching with each other (Column D and E below). However, Column C (being a True +ve) is matching with all the other “False +ve”, e.g. Column B.
Due to identification of Column B as Out of Coverage (though the indicator on home screen shows capital EDGE), the conclusion based on various Blackberry APIs is confusing.
Vipul Pathak 