Hi @MaryS - sorry to hear about the frustration with your new reader!
The 3.55mm post on the Magstripe Reader hasn't changed. Make sure there is no debris in your headphone jack preventing the reader from being inserted.
If you continue to have trouble plugging the reader into your phone, reach out to our Support Team directly. Sign in on our contact page, browse the topics, and click "I don't see my issue" so you can send us an email or call us.
