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Technical documentation is essential for the development of mobile and web projects. This document describes what an application consists of and how much it costs. Of course, it is possible to develop a mobile application without technical specifications, and even an application that works well. However, this is not a guarantee that you will be able to achieve specific business goals with this application. In the technical specification, you describe your mobile app in detail, such as a step-by-step recipe for a dish.
While most of the iPhone’s features are hidden away in apps, widgets, and Control Center, there are plenty of hidden treasures waiting to be discovered through the dial. Unstructured Supplementary Services Data (USSD) codes. They look like a series of numbers interspersed with hashtags and asterisks that you enter like a phone number.
Check the technical data of your iPhone with these dialing codes
Check your data consumption
These are separated by the carrier. For AT&T, touch #3282. For Verizon Wireless, touch #3282. And for T-Mobile, touch #932#. After tapping the code, press the call icon to call your carrier. The information will appear as a text message or notification showing how much data you’ve used for the current billing period. Remember to hang up when the text arrives.
Enter field test mode
Field Test Mode displays a lot of technical data about cellular activity, most of which is probably useless to you, but can help a technician or helper solve a technical problem. To enter this mode, tap *3001#12345#* and then tap the call icon. This will display information about your bandwidth and related metrics on the dashboard.
Check the IMEI number
Like a serial number, the IMEI number is used to identify the phone type, carrier, network, country, and other details. A mobile operator sometimes asks for the IMEI number to solve problems or switch accounts. You can find the IMEI number by searching for it on the settings screen, but it’s also easy to use a dial code. Touch *#06# on the keyboard and the number will be displayed along with the EID and MEID numbers.
Make a test call
You can make a test call to make sure your phone’s calling feature works, even if it only appears to be available from Verizon. To test, dial 832 and an automated message will inform you that your test call was successful.
Disable caller ID for your phone.
If you’re testing your phone’s ability to make calls and you don’t want your number to appear on the other end, you can turn off Caller ID by dialing a specific number. To do this, enter the number after *67, for example *67-555-123-4567, and your number will be displayed privately or anonymously on the recipient’s phone.
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