- Restart your phone.
- Check that your SIM card is fully inserted. Do not use SIM cards that have been modified to fit the SIM slot.
- Your phone may be SIM locked, which prohibits using a SIM card from a different network operator.
- If possible, try your SIM card in another phone.
- I cannot send or receive text messages on my Asha phone (Series 40)
- When using Twitter for Nokia, can I post photos from Gallery?
- Does Twitter for Nokia support right-to-left languages?
- When using Twitter for Nokia, can I edit my Twitter profile?
- What is the difference between Twitter for Nokia and previous Social clients in S40?