For a cheap cell carrier, try Cricket. They're a subsidiary of AT&T and we pay $35.00 per phone a month for unlimited call and text along with 4gb data. Very reliable service, same cell coverage as AT&T (Cricket uses AT&T towers), haven't had any issues whatsoever with them. No contract either.
As far as the I-toy I phone, you might put it on Ebay and see if you could sell it there. Truthfully, If I had used it for any length of time, I'd take it out back and take a hammer to it, then burn the pieces. I'm not kidding, not being smart. I wouldnt know what personal data was still on, or could still be retrieved after you've used it. My work I Toy I have to use doesn't enter my house at the end of the day, it's stays in a box inside the Suzuki (along with a spare Droid phone) at night. I don't trust I phones to be anything but a personal data firehose to Apple and whoever bids highest for the data they do collect.
For a phone, consider a Blackberry 10 OS phone. I don't know what your phone use is, mine is phone, text, GPS, email and web browser. I use a phone to death ! every day for these things. I'm not a big app user (Broadcastify, TuneIn radio used most) but they're available to BB phones. I have to have good security because of the personal info I handle. Never ever had a security issue with a BB phone.
Two Blackberry phones I'd recommend. Both run BB10 operating system (the QNX OS being used by many carmakers now for their entertainment, connectivity and vehicle ECU systems is a development of the Blackberry OS 10 from these phones).
One is the Blackberry Classic, the other is the Blackberry Passport. I've used both of these, and own both phones. An added benefit is both have physical keypads-there is NOTHING better than a Blackberry phone with a physical keyboard. I can only count to 9 1/2 rather than 10-amputated thumb. Even with the thumb stub and the other thumb I can bang out emails almost as quick as being on my laptop. The Classic is built like a tank-solid as a rock, heavy and good shirtpocket size. Put an Otterbox on it and you'll never ever break it.
The Passport is the perfect businessman's phone. It's literally the size of your passport, the big screen helps with document reading on the go. Built like a Swiss watch, solid a bit heavy but tough as nails too. Excellent stereo sound quality. Both phones are touchscreen too. The Classic has a built in mouse of sorts too.
Buy them anonymously off Ebay used ( 50 bucks for a nice Classic to 250 for a good Passport) depending on condition, Passports still command a premium; do a security wipe when you get it,set it up from the setup screen, set up a free BB ID to get software updates and use them to death with confidence. NSA can't hack a Blackberry-the servers aren't in the US and they repeatedly refuse requests to get the keys to them. Much like a Linux OS, you can extend whatever permissions you wan to each program on it-far more control than an I Phone. AND BB's run Android apps too-and you can lock down the permissions the same way. There's a reason our govt still issues them to people in sensitive positions.
Good battery life on both models too-even in a heavy stingray environment.
Buy the AT&T models, plug your cricket sim card in and do one small 3 letter tweak in the data config screen (literally-3 letters) and you're banging with a Blackberry. There are some Android Blackberries out there-the KeyOne, KeyTwo, Priv, etc. They're not true BB's to a purist-they're more secure than a regular android but Android OS is what they use. Get a real BB-the OS 10 models.
One last thing-both phones are "world phones". They aren't dual SIM capable but with the appropriate sim you can literally use them worldwide.
