Before you buy: be sure you have a compatible phone
Most GSM mobile phones are compatible with the GLOBAL1 Overlay SIM card and service.
Currently, GLOBAL1 does not support the following phones. Please check that your phone is not on the list before purchasing GLOBAL1.
Incompatible Phone List
| Brand | Model | Note |
| LG | 1900 | Not supported |
| LG | Chocolate TG800 | Not supported |
| Motorola | XT300 Spice | Not supported |
| PALM | P101UNA | Not supported |
BLACKBERRY USERS! GLOBAL1 works with RIM BlackBerry devices for voice calls and SMS messages. Currently we don’t support BlackBerry data or BBM service. To use BlackBerry data services while roaming with the GLOBAL1 SIM, please switch off GLOBAL1 (menu, GLOBAL1 OFF) to access data. Keep in mind – you will be accessing data on your home carrier plan, subject to their roaming rates. When ready to switch back, (menu, GLOBAL1 ON) all voice and SMS calls will be charged at GLOBAL1 rates, up to 80% off regular roaming charges.
Compatible SIM Sizes
The GLOBAL1 Micro Overlay SIM and GLOBAL1 Nano Overlay SIM cards are in development.
| SIM card size | Example device type | Availability |
| GLOBAL1 Overlay SIM (standard/mini) | iPhone 3/3GS, HTC Desire X | Available now |
| GLOBAL1 Micro Overlay SIM | iPhone 4/4s, Galaxy S III | Early 2013 |
| GLOBAL1 Nano Overlay SIM | iPhone 5 | Q2/Q3 2013 |
GLOBAL DEVICE COMPATIBILITY
There are many factors that impact the GLOBAL1 SIM and device compatibility. There are an enormous variability of handsets available worldwide and different versions of mobile operating systems. While the GLOBAL1 SIM is consistently tested and works with most GSM phones, we cannot guarantee 100% device compatibility. All sales of the GLOBAL1 SIM card are final.