Answered question
I plan to get two SIMs for both of my daughters. I understood that the service is prepaid and once the data limit is reached, it simply won't work anymore. That's excellent. But what is I put money in the wallet for a second phone that don't have the same monthly period?
If you put money on the wallet and the data is finishing, you will pay the extra data.
If you want to authorise only one plan to use the wallet you must have to different accounts, and you can also use the referral for the second one and have 25$ each.
If you need a referral code this is mine K61CD, with this code you will receive 25$ to be applied to your 3rd payment.
It is important to add the referral code must be used during the creation of your plan when taxes are shown.
Other answers
Its ok to have to sim card on the same account ... your wallet will pay for bot of the sim card ... and if the second phone dose not have date your abble to transfer data to the second phone as a gift of data
The wallet is only for services that are extras to the account--extra data, pay as you go texts or phone calls. You cannot pay your monthly bill via the wallet.
If both SIMs are on the same account, the wallet money is shared by both SIMs. If one runs out of data, it will start using the money in your wallet.