If you can send texts, the SIM is good. But there may be one of two (or even both) problems:
If someone using an iPhone sends you a text
using iMessage, you won't get it. And there's nothing
you can do about it. The person sending it has to send it
as an SMS text. (Once one SMS is sent to your number, the iPhone will remember to send future texts to you as SMS.)
If someone sends you an MMS ... you may have the MMS set up incorrectly in your APN. Check them. For Total Wireless, it should be:
Code:
APN Name Total Wireless
APN TRACFONE.VZWENTP
MMSC https://mms.vtext.com/servlets/mms
MCC 311
MNC 480
APN Type default,supl
APN Protocol IPv4/IPv6
APN Roaming Protocol IPv4/IPv6
Bearer Unspecifed or blank
Leave all the rest blank.