iPhones and AT&T MVNOs don't play well together, as Apple has literally locked users out of changing their MMS settings with any AT&T network based SIM card, even in fully carrier unlocked handsets. Through this move, Apple dictates which carriers you can and cannot use, and there's only two AT&T MVNOs from the guide that's gotten Apple's approved carrier blessing - Consumer Cellular and TruPhone SIM. Every other unlocked phone on the planet with the right network band support works just fine with MMS and any AT&T based MVNO you throw at it, and every other AT&T locked phone used with an AT&T MVNO will let you edit the MMS and data APN settings as well.
This is one of the reasons why I don't recommend iPhones. Any device you don't have the full freedom to use with any carrier you like, you don't own it, it owns you - which is quite a statement to heap on when it comes to an entire class of network devices designed around turning its users into the service actually being sold to begin with. When you consider that some of their phones now cost in excess of $1000, that's a pretty jagged pill to swallow. If I'm going to have a universal communications device that's going to narc on my every move and everything I do to build advertising profiles to sell to the highest corporate bidder no matter how much "external" security theater from the scawy gubmit they try to dazzle me with, at least don't charge me an arm and a leg for it and let me pretend I own the thing enough to take it to any carrier I choose....
...but I digress.
There's a reason why I don't include Cricket, and it has to do with who Cricket's parent company is (AT&T), the undercutting of network access pricing AT&T offers their customers through Cricket versus the premiums that AT&T charges to their wholesaler clients (the MVNOs) due to lack of wholesale access regulation in this country, the poor customer service, and the ridiculous terms of service with the nickel and dime fees and charges that impact and hurt their poorest customers the hardest (these are charges and fees, I might add, that no other MVNOs charge).
There may be a couple more brands in general that I should update the guide with (US Mobile, mostly, maybe Ultra, Twigby or Boom), and at least one more I should probably at least downgrade at this point (Airvoice, though they are trying in earnest to recover from their recent problems)... but for the most part, if a carrier isn't in the guide? There's probably a good reason why. I'm picky about which companies I recommend.
Cricket doesn't pass that criteria, and it's partly due to the damage they're doing to the MVNO marketplace in general. It took wholesalers repackaging cheaper plans for over a decade to get the major carriers to even start dropping their per line costs (which in and of itself highlights the absurdity of mobile pricing in this country that third party resellers could offer cheaper phone plans - thanks deregulation!), and once these MVNOs actually started cutting into their profit margins, the carriers started fighting back dirty to reclaim customers, shore their profit margins back up, and drive out of business the only real competition they had in the marketplace... their own wholesale customers. Wholesale mobile network access and pricing in places like Europe are regulated, protected, and required, and it actually seems to help keep costs lower and network compatibility higher for everyone, and competition stiffer. We have no such protections here, so the only way to protect that diversity and the businesses that helped drive down prices in the first place is not to do business with the major carriers hiding behind different names or have no incentive to keep costs down once the competition is driven out.
Unfortunately, most people care more about getting their ridiculous mobile data habits on for as cheap as possible right here and now because using less of anything is for chumps, and give zero cares for the quality of the customer service they receive or the fact that the companies they're dealing with have histories steeped with predatory and exploitative pricing whenever their competition thinned out. It's a losing battle.
As for visual voicemail, it's a premium feature that usually gets reserved by the major carriers for the people willing to go postpaid and under contract. Google Voice can provide similar service, but due to the above problems with wholesale pricing in the mobile industry combined with promises of "unlimited" services while playing dangerous budgeting games in an effort to appear competitive in price, more and more MVNOs are abandoning hard numbers on minutes provided, and where the term "unlimited" crops up, services like call forwarding (used to forward your cell number to a third party voicemail service) usually disappear and become violations of terms of service to use.