Going to Korea soon, need a pay as you go SIM card?

I'm in the States right now. I have a Verizon iPhone 6 so it works with most carriers. I need a plan that has a few texts and maybe 10 minutes of call. I will only be gone for a week and don't plan on texting (maybe 20-30 at most) much nor using the phone to call. I just need a phone to respond to some texts and make a call when I get back to the States. Where can I get this pay as you go plan that would work for me?

How to monitor what apps your spouse downloades on an iPhone?

I suspect foul play. AGAIN! I think my boyfriend is using the same app he was using when he cheated on me a year ago. Is there a way I can confirm if this app is being downloaded and deleted? We live together. I think he uses it to meet people and then deletes it. How can I find out what apps he downloads or deletes?

Am I able to delete a message if it hasn't delivered?

So on iMessage I accidentally texted the wrong person but it hasn't said delivered yet and I deleted it, but does that only delete it from my iphone? Because I know if it doesn't say deliver that means the persons phone is dead or on sleep mode and I deleted it before it could say it.

I can't get Instagram notifications to work?

I'm on an iPhone 5S that's on IOS9. I have the notifications turned on from inside the Instagram app, but in the settings app there's no option to turn ig notifications on or off. It's not in the list of apps in the notifications section, and there's no option for them in the Instagram section of settings. Help?! (I don't get them on my lockscreen or my home screen)

IPhone 6 making calls on its own to numbers thats are not on my contacts?

I have an iPhone 6 and family sharing on it with my boyfriend because we have an apple music account together. Today a number called me, a number that I didn't have saved, and I asked my boyfriend to look it up on his phone and the number was saved to his contacts. I called the number back and the person said that I had called them earlier, the crazy part was that I hadn't, my number even showed up on the persons call log but I had no record or the call on my log. How could this have happened?

Siri on Iphone 6 keeps popping up?

When I've got my earphones in and listening to music on my phone Siri keeps activating every 5-10 seconds sometimes even without my music it keeps popping up. I turned Siri off and the voice control keeps activating WHAT'S GOING ON?