Simple Mobile Buy More Data Online : Send the keyword BUY to 611611 to receive prompts for purchasing more data directly from your device. Add-ons typically start working once your plan's high-speed data is exhausted. Note that unused add-on data generally does roll over to the next billing cycle. 2 GB Add-On : ~$5.00 5 GB Add-On : ~$10.00 10 GB Add-On : ~$20.00 Hotspot-Specific Data What if IIf you.. Simple Mobile Extras - SIMPLE Mobile simple mobile buy more data : Use the My Account App to select "Add-Ons" or "Refill" and choose your desired data pack. : Send the keyword BUY to 611611 to : Dial 611 from your Simple Mobile phone to follow the automated voice prompts for a refill. Data Add-On Options 2 GB Add-On : ~$5 : Log in to your My Account on the Simple Mobile website and navigate to the add-on section. To buy more data for your Simple Mobile account, you can purchase a one-time data add-on through several quick methods: