Block Caller ID
With a simple code you have the ability of masking your own phone number. To do this dial #31# and the phone number.
It'll look like this for the person receiving the phone call
See How Strong Your iPhone Signal Is
Signals bars are an imprecise way of measuring whether your signal is "Good" or "Bad". To do this you'll have to first enter a hidden "Field Test Mode"
Dial : *3001#12345#* then call
Then immediately hold the power button you can explore these other complex options later.
Once the power down screen pops up hold the home button until you're back on the homescreen. Now you have a super precise way of measuring reception. Here's how to read it
Find Your Phone's Unique Code
Every phone has it's own unique code identifier that is displayed inside the phone's settings. But you can access this quickly just by typing in *#06#
Discover Where Your Text Messages Go
Regular SMS works by forwarding your message wirelessly to a message center via a specific phone number. To figure out your carrier's secret number dial *#5005*7672# then call
Call Barring And Call Waiting
Call Barring allows you to block incoming and outgoing calls while Call Waiting allows you to place incoming or current calls on hold. If you pay for either of these services then you can use these codes:
*33*PIN# - Enables Call Barring
#33*PIN# - Disables Call Barring
*#43# and "Call" - Call Waiting Status
*43# and "Call" - Enables Call Waiting
#43# and "Call" - Disables Call Waiting
*#21# - Call Forwarding Status
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