(By the way, I have two smartphones because my mobile phone carrier is CREDO Mobile and they don't have brick-and-mortar stores, so you have to call them, or contact them via the Internet, in order to receive customer service on any of their products. Thus, if I have an issue with one of my phones, I can contact them with the other phone!)
You see, I use Google Calendar entries, and specifically the calendar entry description, in order to document how much, and how often, I used cellular data for my cell phone data plan on both of my smartphones.
Therefore, here is the calendar entry description for April 13th, 2026, which shows the entire day's worth of cellular data usage for one of my phones, including the "start of day" and the "end of day," along with what each portion of data usage was for and the time each one started and finished!
Plus, at the bottom is the "billing cycle available available data" calculations that help me to see how much total data that I have in comparison to how many days have already transpired in the billing cycle, as well as how much data is still remaining per how many days that are left in the billing cycle, including today's number of days left, and the number of days left starting with the next day:
04/13/2026
11.48 GB at 11:10 a.m.: Late start of the day.
11.50 GB at 11:19 a.m.: Finished the data usage update for my other smartphone.
0.02 GB of data usage (11.50 - 11.48 = 0.02)
0.02 GB of total data used (0.02 = 0.02)
11.50 GB at 11:30 a.m.: Started downloading the updates for my smartphone.
0.00 GB of data usage (11.50 - 11.50 = 0.00)
12.37 GB around 11:46 a.m.: Finished downloading the updates for my smartphone.
0.87 GB of data usage (12.37 - 11.50 = 0.87)
0.89 GB of total data used (0.87 + 0.02 = 0.89)
12.37 GB at 12:06 p.m.: Started paying my CREDO Mobile bill.
0.00 GB of data usage (12.37 - 12.37 = 0.00)
12.39 GB at 12:08 p.m.: Finished paying my CREDO Mobile bill, which included starting reconciling my monthly budget in handwritten format and in digital format.
0.02 GB of data usage (12.39 - 12.37 = 0.02)
0.91 GB of total data used (0.02 + 0.89 = 0.91)
12.41 GB at 12:41 p.m.: Finished reconciling my monthly budget in handwritten format and in digital format.
0.02 GB of data usage (12.41 - 12.39 = 0.02)
0.93 GB of total data used (0.02 + 0.91 = 0.93)
12.41 GB at 12:46 p.m.: Started doing news searches through Google, which included watching YouTube videos.
0.00 GB of data usage (12.41 - 12.41 = 0.00)
12.83 GB at 5:39 p.m.: Finished doing news searches through Google, which included reading city and state news.
0.42 GB of data usage (12.83 - 12.41 = 0.42)
1.35 GB of total data used (0.42 + 0.93 = 1.35)
12.83 GB at 5:39 p.m.: Started reading Saturday, April 11th newsletters (1 of 13), which included writing a Haiku-style poem for the 30th anniversary of National Poetry Month.
0.00 GB of data usage (12.83 - 12.83 = 0.00)
12.97 GB at 7:39 p.m.: Finished reading Saturday, April 11th newsletters (13 of 13).
0.14 GB of data usage (12.97 - 12.83 = 0.14)
1.49 GB of total data used (0.14 + 1.35 = 1.49)
12.97 GB at 7:43 p.m.: Started reading Sunday, April 12th newsletters (1 of 20), which included watching YouTube videos.
0.00 GB of data usage (12.97 - 12.97 = 0.00)
13.48 GB at 10:05 p.m.: Finished reading Sunday, April 12th newsletters (20 of 20) and end of the day.
0.51 GB of data usage (13.48 - 12.97 = 0.51)
2.00 GB of total data used (0.51 + 1.49 = 2.00)
---------------------------------------------
---------------------------------------------
01. BILLING CYCLE AVAILABLE data usage:
20.00 GB of total available usage
÷ 31 days in March
= 0.65 GB [0.64516129032258064516]
× 23 billing cycle day(s)
= 14.84 GB [14.8387096774193548387] available per-day usage
02. TODAY'S STARTING data usage:
14.84 GB (billing cycle available per-day usage)
- 11.48 GB (starting app usage)
= 3.36 GB ([last four numbers of phone redacted]
billing cycle per-day usage remaining)
---------------------------------------------
---------------------------------------------
03. TODAY'S ENDING data usage:
14.84 GB (billing cycle available per-day usage)
- 13.48 GB (ENDING device usage)
= 1.36 GB ([last four numbers of phone redacted] billing cycle per-day usage remaining)
04. TODAY'S TOTAL data usage:
13.48 GB (ENDING device usage)
- 11.48 GB (starting device usage)
= 2.00 GB ([last four numbers of phone redacted] today's total device usage)
05. TODAY'S REMAINING data usage:
0.65 GB (available per-day usage)
- 2.00 GB (today's TOTAL device usage)
= (1.35) GB ([last four numbers of phone redacted] today's available usage remaining)
---------------------------------------------
---------------------------------------------
06. TOTAL REMAINING data in the billing cycle per day, INCLUDING TODAY:
20.00 GB (total available usage)
- 13.48 GB (ENDING device usage)
= 6.52 GB (total remaining data)
÷ 9 days in the billing cycle
= 0.72 GB [0.724444444444444444444444] ([last four numbers of phone redacted] total average data remaining in the cycle per day)
07. TOTAL REMAINING data in the billing cycle per day, NOT INCLUDING TODAY
20.00 GB (total available usage)
- 13.48 GB (ENDING device usage)
= 6.52 GB (total remaining data)
÷ 8 days in the billing cycle
= 0.82 GB [0.815] ([last four numbers of phone redacted] total average data remaining in the cycle per day)
So then, that's the entire reason that my Haiku-style poem for the 30th anniversary of National Poetry Month was so rushed!
