Egypt → Mauritania
Egypt plugs
Type C
Type FMauritania plugs
Type C
Type EShared plug type: C
Compatibility: Compatible
Voltage — Egypt 220V — Mauritania 230V
Voltage difference is small. Most electronics will work safely.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.