On Android, as of app version 1.5, users now have the ability to block and allow ranges of phone numbers. That means that if you’re constantly getting spam calls from a specific area code or exchange code, you can now block them with ease.

To block wildcards in the RoboKiller app:

1. Tap on the Block/Allow Screen
2. Tap the “+” button to add a new number or range to block
3. Tap the option at the bottom of the screen labeled "Tap Here" to block a range of numbers rather than a single number 
4. Enter the range you’d like to block (i.e. +1732, +1732444, etc.)
5. Tap the "SAVE" button on the top right of your screen

Once you’ve entered a range of numbers that you’d like to block, any phone call you receive that matches that range will be blocked by RoboKiller.

Conversely, if there’s a range of numbers that you always want to receive calls from because you know they are not spam, you can add that range as an allowed range to RoboKiller, removing those numbers from your block list.

To allow wildcards in the RoboKiller app:

1. Tap on the Block/Allow Screen
2. Tap on the Allow pane
3. Tap the “+” button to add a new number or range to allow
4. Tap the option at the bottom of the screen labeled "Tap Here" to allow a range of numbers rather than a single number 
5. Enter the range you’d like to allow (i.e. +1732, +1732444, etc.)
6. Tap the "SAVE" button on the top right of your screen

Once you’ve entered a range of numbers that you’d like to allow, any phone call you receive that matches that range will be allowed by RoboKiller.