Discover the secret world of USSD codes that unlock hidden menus, features, and quick access to phone information on your ...

If your Android phone shows "Connection Problem or Invalid MMI Code" when you dial something like *#21# or *135#, don't panic. This is one of those errors that looks scarier than it actually is. Most ...

USSD and MMI codes are short sequences of stars, hashes, and numbers you type into your phone's dialer to reach hidden information, hardware tests, and carrier services. Many older lists circulating ...

I have noticed some very weird behaviour with 1pmobile in terms of answerphone diverts. The default setup on the website when you get your sim seems to be most things on in network settings, including ...

This is the fastest fix because it forces your phone to completely disconnect from and re-register with your carrier’s network. A surprising number of MMI code errors come from a temporary network ...

If you are an Android smartphone user, many times you have come across a message like 'Connection problem or invalid MMI Code' on dailing a USSD code. It's a serious problem which affects the phones ...