Yeah, if you have a contract phone, can't you block their numbers by contacting your service provider? If you have a Pay as you go phone, get a new one.

Assuming OP has iOS, 7 has a number blocking option in the settings. Iirc, some androids will block numbers too

I don't think so. Atleast with AT&T. I actually came to their store in person and there was nothing they could do with the annoying number calling me.

You can pay $2.99 a month or something like that to block 30 numbers with AT&T. A ripoff if you ask me, but the option's there.

If you're with US Cellular you can block numbers

An easier option would be to simply answer one of their many calls and tell them to "remove your number from their calling list." Always works for me. They legally can't call you again if you ask them not to. If not, you'll keep getting them because a computer goes down the list and repeatedly calls the numbers. Also, add your number to the national Do Not Call list, so other telemarketing places don't pay to get your number. You shouldn't have to pay to block it. Besides, some call from multiple lines in their network and it's impossible to block every individual number!

You can also answer the call and tell them to remove your number off their system, worked well for me

Yes but that would cost OP money, which we've learned OP isn't too into spending a lot right now.

That may work here in the States, but OP I'd in Guatemala, so it depends in their laws.

*is & on. Damn you fat thumbs.

This men. Strikes again with his not funny at all jokes.

This ^ all you have to say is "Take me off your list" and they are prohibited by law to never call you again.

only under certain circumstances

How wrong you are

but what if someone important leaves a voicemail?

I think OP just has to call their cell phone provider and they should be able to block the calls. Provided the telemarketers aren't withholding the number.

The op can also change the settings on their phone to automatically reject calls from numbers not in their address book.

on my phone you just put the number on an ignore list. i had to do thar with a few telemarketers. they can technically still call you but you are none the wiser.

But does that work in other countries?

Half of those lists get sold to telemarketers cuz they know the number is active then.

A telemarketer that calls a number on the do-not-call list risks an $11,000 fine here. Calling cell phones is also illegal for telemarketers as well. Of course I'm only referring to where I live.