I previously posted that, based on my actual data usage over the past year and half, using a B-mobile Fair SIM would have cost me about half of what I've paid to Docomo for my smartphone data plan. Now it's time for a real world test, so I'm going cold turkey on my Docomo paket houdai data plan.
I've disable data on my Docomo ht-03a and will be using that handset for voice only. For data, I will also be carrying around a Nexus One with a B-mobile Fair SIM. I will do this until I exhaust the prepaid 1000 MBs, or until August 10, 2011, which ever comes first.
The charge on the SIM is currently 890 MB that expires on August 10th. The test will start from today, May 7th.
While it would be preferable to start this test with exactly 4 months and 1000 MB, I used about 100 MB in mid April testing the SIM with skype, etc. Having to carry two handsets is not exactly ideal, but since I am subscribed to Docmo's two-tiered packet-houdai data plan, I have incentive not to use my Docomo handset for data, since I will actually save money if I don't.
The MyDocomo site tells me that I have used zero packets so far in May and have only incurred the minimum charge of ¥372 for data so far. (This is because I was out of Japan during Golden Week.) If the B-mobile Fair SIM lasts me for all of May, June, and July, that would be a savings of over ¥15,000 (off my Docomo bill), since this would encompass three full billing cycles.
In the interest of a "Fair" test, I will try to not change my data consumption habits. Background data, automatic syncing, and market notifications are all enabled. However, it is impractical not to make some changes to my habits, since I will no longer have an unlimited data plan. Settings I changed on the phone are:
- Turned off picasa web album syncing.
- Turned off automatic updating for all installed apps
- RSS reader (new rob) is set to download only on wifi
- Rooted to install an ad blocker (AdFree)
This is a bit off topic, but to root the Nexus One with the Android 2.3.4 OTA installed, I:
- booted into fastboot and
fastboot oem unlockthe bootloader (requires the SDK and fastboot)
fastboot flash recoveryAmon_RA's recovery for the Nexus one
- booted into recovery and flashed su.zip
- removed the Gingerbread files that overwrite custom recoveries on boot (otherwise you have to reflash the recovery every time you need it)
- installed superuser from the market to control which apps can invoke
- installed busybox from the market because it is a dependency for many apps that require root.